Sister's plea to find brother's killer

The sister of a homeless NSW man found stabbed to death under a bridge has made an emotional plea for help to find her brother's killer.

The body of Reginald Mullaly, 69, was discovered in a makeshift shelter on the Great Western Highway at Bathurst in the state's west in September 2015.

Police have been unable to track down his killer.

His sister Dawn Brodie on Wednesday appealed for anyone with information to come forward.

"You are not dobbing in a mate, you are helping me find out what happened to my brother," she said.

"I miss him every day and I talk to him every day."

Police say two of Mr Mullaly's acquaintances were the first to find his body.

They've urged anonymous callers who tipped off police through Crimestoppers in September and October to again make contact with detectives.

"The information we received from these people have helped the investigation greatly, and we simply need to talk to them again," detective chief inspector Colin Cracknell said.

A post-mortem revealed Mr Mullaly died from a stab wound to his chest and that he suffered several "unexplained injuries".

He had $30,000 in his bank account before being murdered, something police believe may have been a factor in his death.