Doerman, 33, was sentenced to three consecutive life terms in Clermont County, Ohio, last week after he pleaded guilty to aggravated murder charges.
He also received a 16-year sentence for two felonious assault charges against his former wife and stepdaughter.
Prosecutor Mark Tekulve previously said he would seek the death penalty for the brutal slayings that took place on June 15, 2023, in Monroe township, 120km west of Columbus.
The Associated Press reported that he instead pursued the life sentences to spare further “agony” for family members after the trauma they experienced after the murders of Clayton Doerman, 7, Hunter Doerman, 4, and Chase Doerman, 3
“My job, as I saw it this week, was to relieve them of that additional agony,” he told media last week.
The boys’ mother, Laura Doerman, admitted to the the court that the plea deal she approved would surprise some but delivered “finality to the court case for my daughter and me”.
Tekulve this week revealed more details of what led to the murders, briefing media on Chad Doerman’s behaviour before the killings, and told of the heartbreaking moment he turned a gun on his own family.
He said Doerman searched online for a song called Happy in Hell by Colt Ford on the morning of the killings, showing the lyrics to the song’s chorus, the Daily Mail reported.
“I’m in a catch twenty-two/ Damned if I don’t damned if I do/ I’m in love with another girl/ And I’ve been dreamin’ in another world/ I’ve been livin’ with the devil/ While I’m creepin’ with an angel/ All’s well that ends well/ I guess I’ll be happy in hell.”
He then called his father around midday and said that “Clayton is going to be the hardest one”.
The prosecutor said that Doerman’s father only realised the significance his son’s reference to his eldest boy after the killings.
Chad Doerman with the three sons he executed in cold blood.
Doerman’s disturbing comments to family continued as his told wife Laura “this will be my last good meal” as the pair ate lunch.
“At 3.30, 3.45pm, he begins to read the Bible to Hunter. He’s walking around the house with the Bible mumbling ‘Chad knows what’s right, Chad knows what’s right’,” Tekulve told reporters.
He opened the home’s gun safe at 4pm, saying he was “just playing around” after his wife said his action were scaring her.
“He did this to again allay any concerns about her safety, his safety, or the safety of the boys. He actively deceived her,” Tekulve said.
Doerman went on to tell his sons that he “loves them and they did nothing wrong” and they were “the best boys ever”.
He then chased Clayton through the home before executing him and his stepdaughter tried to protect her little brother Chase by picking him up.
A ring camera at the home captured the teenage girl telling Doerman: “Please don’t shoot me” before he forced her at gunpoint to put her little brother down.
The preschooler then ran for his life as his father reloaded his gun.
In a last desperate bid to protect her child, Laura Doerman then placed her finger over the barrel of the weapon but her husband fired anyway, injuring his wife before turning his attention back to his little boy and executing him in front of his mother.
“You got the right to remain silent, ****ing use it.”
FAMILY VIOLENCE
How to get help:If you're in danger now:
• Phone the police on 111 or ask neighbours or friends to ring for you.
• Run outside and head for where there are other people. Scream for help so your neighbours can hear you.
• Take the children with you. Don't stop to get anything else.
• If you are being abused, remember it's not your fault. Violence is never okay.
Where to go for help or more information:
• Women's Refuge: Crisis line - 0800 REFUGE or 0800 733 843 (available 24/7)
• Shine: Helpline - 0508 744 633 (available 24/7)
• It's Not Ok: Family violence information line - 0800 456 450
• Shakti: Specialist services for African, Asian and Middle Eastern women and children.
• Crisis line - 0800 742 584 (available 24/7)
• Ministry of Justice: For information on family violence
• Te Kupenga Whakaoti Mahi Patunga: National Network of Family Violence Services
• White Ribbon: Aiming to eliminate men's violence towards women.
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SUICIDE AND DEPRESSION
Where to get help:
• Lifeline: Call 0800 543 354 or text 4357 (HELP) (available 24/7)
• Suicide Crisis Helpline: Call 0508 828 865 (0508 TAUTOKO) (available 24/7)
• Youth services: (06) 3555 906
• Youthline: Call 0800 376 633 or text 234
• What's Up: Call 0800 942 8787 (11am to 11pm) or webchat (11am to 10.30pm)
• 0800 Anxiety Helpline: 0800 269 4389 (0800 ANXIETY). This service is confidential and free of charge. Open 24/7.
• Depression helpline: Call 0800 111 757 or text 4202 (available 24/7)
• Helpline: Need to talk? Call or text 1737
• Aoake te Rā (Bereaved by Suicide Service): Call 0800 000 053
If it is an emergency and you feel like you or someone else is at risk, call 111.