The distraught sister of a man who was brutally murdered in his Sydney housing commission unit two years ago has pleaded for public help to catch his killer, as police offer a $1 million reward.
Mark Allan Russell - an avid Cronulla Sharks fan known as 'Sharky' - was found stabbed to death in his Surry Hills unit on February 25, 2018.
The 53-year-old had only recently moved into the unit after spending almost two decades living rough on the streets.
A fun-loving larrikin and "everybody's friend", Mr Russell's sister Julie Ann Stewart said her brother was just getting his life back on track.
"Mark was a kind, loving person (who was) living rough, which doesn't mean that he deserved to be murdered and taken at his age," she told reporters on Wednesday.
Ms Stewart and Mr Russell's son Shayne Dodds joined police on Wednesday as they announced a $1 million reward for information about his death.
Ms Stewart cried as she told reporters she would love and support her little brother forever.
Growing up as wards of the state, the pair had experienced a lot of trauma together and her family deserves justice, she said.
"When you're not with your parents, got no family, you've only got each other," she said.
"Please, if you know anything, help us solve this nightmare and let Sharky Mark rest in peace."
Police have not been able to determine motive for the killing - previously telling the media Mr Russell wasn't in any disputes and didn't owe anybody money.
Homicide Squad Commander Detective Acting Superintendent David Laidlaw said many people had visited Mr Russell's unit the day before his body was found and people were heard arguing at 10pm that night.
Police have been unable to speak with everyone who visited Mr Russell's unit that day, and hoped the reward will motivate them to come forward.
"Someone must have heard or seen something," Ms Stewart said.
"If any of you can think of anything that seems out of the ordinary around those two days - something either remarkable or just small - can you please contact the police."
On Thursday an inquest into Mr Russell's death begins under Deputy State Coroner Derek Lee at Lidcombe.