"When I came out of the elevator I thought there was a fire because everyone was running around like something was on fire," he said.
"When I came around the corner I just thought these two guys were having a fight, when I looked closely I saw he was stabbing him in the ears and I thought it was just them two.
"I grabbed the knife off him and threw it on the ground and then the crowd kind of moved away, there was about 40 of them and none of them spoke very good English , when they moved I saw [Parmita] was on the ground and I didn't know it then, but she wasn't alive."
He said he took Singh away from the crowd and sat him down to try and calm him down.
"He was still yelling out and then he pulled out another knife so I threw that knife on the ground."
The police arrived soon after and took Mr Singh - who still had a number of knives on him - away.
Mr Paki said the incident was deeply shocking and revealed how prevalent domestic violence was in the community.
"It's sad because domestic violence is just everywhere - it's not just Indians but for all communities. This happened right in the middle of Queen St. You can't stab your wife just because you think she is having an affair."