It can happen in a second. A king hit, a coward's punch. And can result in death. In the below extract of his new book, One Punch, Barry Dickins meets Caterina Politi whose son David's life was taken at age 22 while on a night out with friends in Melbourne.

"It was almost five and a half years ago down at Portsea. My son and his friends were all out on 30 December, celebrating a friend's birthday, and it went late into the night.

"They caught the bus and ended up at the Rye shops and were walking towards Rosebud, where their accommodation was. It was a cool night, not hot at all, unusual for summer. The police said that David had kept his arms tucked into his shirt for warmth. It had just ticked over midnight."

David and his friends walked past the ATM, which was where they saw the killer for the first time.

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Caterina Politi. Photo / Michael Keating
Caterina Politi. Photo / Michael Keating

"This boy called Dylan Closter crossed over the road and as he was doing that, one of my son's friends was mucking around a bit with a street sign just for the fun of it. They were
just walking along the footpath together and David's two friends were at the back. Closter walks up to David and gives him a hip and shoulder, you know, as a challenge. He hip
and shouldered him big time to check if he would fight him.

"David called out, 'Oh have a sick one, mate?' And David and friends kept on walking. Then Dylan Closter shouts out, 'Do you want a fight?' David keeps walking away and says, 'F*** off!', or words to that effect."

The assailant went into a fighting stance, a boxing position. He was ready for a fight.

"We were told David missed the first punch, then Closter tackled him to the ground.

'In that moment, Closter's mates ran across the road and David's friends, who were ahead, heard the commotion and ran back to assist. A boy or man called Tyrone Russell, who was a professional Muay Thai fighter and one of that group, punched two of David's mates called Jesse and Julian.

"Those blows were very forceful. Jesse was unconscious on the ground with a broken jaw. Julian was also felled to the ground and was lucky he fell on to his side, sustaining cuts
and bruising. A few of Closter's friends had been watching the fight but didn't do anything to stop it.

"There was a guy called Vasu in David's group who was punched to the side of
his head and that was this man Thomas McCluskey-Sharp's fifth offence that night. He was on a three-month suspended sentence. He had assaulted a man and a woman because he felt like it. He allegedly assaulted two young boys in the Rye carnival area approximately 45 minutes earlier, in an incident totally unrelated to David and his friends. These charges were dropped."

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She is weeping and I tell her how sorry I feel for what has happened and she says that is alright and stares straight into my eyes and blows her nose to continue.

Although David's friends ran back to assist they were ambushed by Russell and McCluskey-Sharp. This allowed Closter to punch Andy (the birthday boy) and Vincent.

David got to his feet and was seen on CCTV walking away backwards with his hands in the surrender position, showing he was of no threat and did not want to fight.

Caterina Politi with son David Cassai who died from a single punch while on a night out in Melbourne. Photo / Supplied
Caterina Politi with son David Cassai who died from a single punch while on a night out in Melbourne. Photo / Supplied

"All I know was that my son David got up off the ground backwards after the hip and shoulder attack. He tried to communicate with his attacker, you know, to appeal to him.
He had his arms up, saying through his use of body language that enough is enough, showing he wasn't going to fight or participate," Caterina cries.

"It was a roundhouse-style punch, it lifted my son off the ground, and he was unconscious before he hit the ground. It lifted him by his jaw and shattered his skull. It created brain trauma spontaneously and then there was no blood supply to my son's brain.

"Then they all ran off, the whole gang of them, and Closter yelled out, so cocksure of himself, he yelled out, 'This is what we came here for!' Like it was a triumph for them or something great. Like they were having their fun, kind of thing.

"David was resuscitated at the scene by a 17-year-old boy, a complete stranger, until the police and paramedics arrived. I got the phone call at about 1am; it was Vasu on the phone, and he said, 'Something has happened to David'. I then spoke with Julian, who said he had spoken with David.

"When I spoke to the police, they didn't paint a worst-case scenario at all. So initially I thought that David would be okay, but he wasn't okay. 'Is he going to be okay', that was all I thought about.

"David was airlifted to the Alfred Hospital and I knew he was going to the best possible hospital. Together with David's father, Paul, sisters Elisa and Luisa and their partners Kosta and James, we drove to the hospital.

David Cassai. Photo / Supplied
David Cassai. Photo / Supplied

"We saw the air ambulance land on the helipad and saw David up high on the stretcher, heading to the ED; that was the worst thing, to see that, to have to look at that. We were
outside on the ground level of the hospital. I remember the rotor noise. The noise of that helicopter haunts me now."

In the waiting room, Caterina was frantically making calls to friends and family, letting them know what had happened.

"They gradually arrived, coming to wait with her along with David's father and sisters. After an agonisingly long wait three doctors came out and I said to my daughters, 'This
isn't going to be good news'. If there is just one doctor you might have some hope, but with three doctors coming at you, there's not a lot of hope going to come out of it. And then the doctors said, as if they were saying it together, 'There is nothing we can do for your son', but they would still run tests to be absolutely sure."

Caterina takes a deep breath.

"I heard them, but it was as though they were talking to someone else. It was all going too fast, the whole thing was speeding out of control. One of the doctors said to us, 'Have
you considered organ donation?' It was too fast to answer something like that. It had only just happened and they were requesting my son's organs."

Caterina and her family agreed to the organ donation if it came to that.

"We were gunned down. We didn't have a chance to take it all in."

She was taken to see David, and she cries as she remembers the next mad scene.

"At three thirty in the morning; this was in among a lot of cubicles. But the curtains weren't drawn. I can't believe they didn't draw the curtains around our son. He was so
exposed, it was like he was abandoned. Then they took David up to intensive care, to a more private room to be monitored.

"It was as if my time with David was hijacked. They were already thinking of possible organ recipients. They ran more tests and with those in hand the doctor announced to us that David was brain dead."

David died at 3.55 in the afternoon on New Years' Eve, 2012. From that first phone call it had been only 15 hours.

"This allowed us to hug him and kiss him; he was still warm and I am forever grateful to the first responders for keeping him alive.

David with his mother Caterina. Photo / Supplied
David with his mother Caterina. Photo / Supplied

"We stayed with him while he was on the ventilator for 30 hours. As it ticked over to midnight a new year had arrived. I could see the fireworks in the distance and staff on
the helipad celebrating the New Year. Ours would be one of devastation and grief, losing David at the hands of this evil human. Then at eight thirty in the morning they took him
away to collect his organs. We said another goodbye and he looked so beautiful and so special. I can still see it all clearly, the donation people closing the door. It was only when I saw the homicide squad that it occurred to me that David had been murdered."

She is crying again, and why should she not, and as she blows her nose I look again at the photo of mother and son, grinning away. The birds of early September commence their
sweet and unstoppable whistling sounds, which suddenly seem ironic and cruel.

"I wasn't able to sleep for weeks and months after it happened and then of course the ensuing nightmares come, don't they? I dream of it, and of catching the perpetrator. He
murdered my son, who just wouldn't fight him and who put up both of his arms to show surrender. He still killed him anyway.

"It unsettled his father when it became clear the extent of the attack; he should have been charged with murder because he went out deliberately to murder someone; anyone. He
tried to provoke my son, who wouldn't fight him and put up both of his arms to show surrender, but he still killed him anyway. The missed punches are murder too; even the missed ones are murder.

"The police said they needed to prove intent and I said the intent was there after the first contact, then the boxing stance, then the first punch that missed, the tackle to the ground; he then punched Andy and Vincent, then he chased David; even though David was walking away, Closter unleashed that ferocious punch.

"After nearly two years and many not guilty pleas, the men started by pleading guilty, Russell to recklessly causing serious injury and recklessly causing injury and affray. One
was sentenced to fifteen months … maximum. It was then increased to three years on appeal and 21 months non-parole.

One Punch author Barry Dickins.
One Punch author Barry Dickins.

"David's killer pleaded guilty to manslaughter and affray. He did a plea bargain, having two common assault charges dropped."

David's killer was eventually sentenced to nine years three months in prison, with a non-parole period of six years.

"There was no expression on his face at all. He was in court seated behind us, right behind us. No remorse and no contrition. You asked me if he sent me a letter of sorriness; well of course he didn't, because he wasn't sorry at all. I mean, he got away with it. Made a joke out of the law, he did. David's friends used to see him in the shopping plaza, doing his shopping while on bail. That was extremely frightening for them."

Caterina never received an apology letter from Closter.

"When this happened, it was put on Facebook straight away that my son David started the trouble, that is what Closter's mates posted on Facebook, but I said to all of them, 'Ask Victoria Police to view the CCTV footage and that will clearly show who the aggressors were. The one who wrote that it was David's fault, he commented no more."

Through STOP.One Punch Can Kill, Caterina now receives invitations to speak about her loss at schools and sporting clubs. She tells people about the dangers of excessive drinking and taking drugs, and how this can lead to violence.

"Also be aware of who you are as a person, acknowledge any issues with aggression and seek help. Through STOP.One Punch Can Kill we are doing what we can to proactively
promote this. But we can't do it all alone. We can all play a part to stop these senseless acts of violence. It begins at home with parents, it can be reinforced through schools, the
government, the police and the media."

It is now time for me to go, as she has been speaking in such a heartfelt way and so willingly on a subject no mother ought to have to wrap her mind and memory around. I walk down her drive back to my car, having shaken hands with her politely. She tells me that I should get in touch if she can help me further.

It is heartbreaking as well as ennobling to hear Caterina Politi speak, and to remember the very thing no mother ought to resurrect, but she is articulate and eloquent and everything she tells me is pure and perfectly in harmony with her everlasting love and adoration of her poor son.

The cover of One Punch
The cover of One Punch

One Punch
By Barry Dickens
Published by Hardie Grant Books
RRP: $32.99