VANCOUVER -- Vancouver police released new surveillance footage from the city's West End in hopes of gathering more information about a serious assault that left a man with life-altering injuries.

The incident happened on Nov. 30, just after 12:30 a.m.  

Police say 46-year-old Andrew Kurra was walking on Thurlow Street, heading north from Davie Street, when had an argument with a group of people. He was then assaulted.

On Monday, the VPD released two short surveillance videos showing two men and a woman walking south along Bute towards Davie Street shortly after the assault.

"We think this is a random attack that escalated from the initial verbal argument between the victim and a group of people. We want these three people to come forward to let us know what happened," Sgt. Aaron Roed said at a press conference.

Police are calling the three individuals "persons of interest" and are trying to determine their involvement in the attack.

"Right now, we want to know what happened, why they were in the area and if they have any information into the assault," Roed said.

Kurra has been in hospital since the attack and has not been able to speak to investigators due to the extent of his injuries.

Pam Loewen, Kurra's sister, told CTV News Vancouver he just woke up from a coma recently.

"He's doing a lot better now," she said. "He smiles when he sees me, so he does recognize me. But I have been warned by the doctor that it's very early still and we don't know how far he'll progress to, so that breaks my heart."

She explained her brother will have to relearn how to walk and talk and the road to recovery will be a long one.

"There's still extensive brain damage, there's no doubt about that," she said. "I was told his personality is going to be gone, so he will have to reinvent himself now."

Loewen described her brother as an "extremely generous" and "super kind" man who "loved making friends wherever he went."

She said the assault has now "literally destroyed his life."

She said she's hopeful the new surveillance videos will help police crack the case.

"I hope they find out who did this. It would be nice to have some answers," she said.

Anyone with information can call Vancouver police at 604-717-2541 or send tips anonymously through Crime Stoppers.