Guy Haymes, 59, was found with serious head injuries inside a unit on Pittwater Road following an alleged assault on February 27.
He was taken to hospital in critical condition but later died on March 15.
NSW Police established Strike Force Flat in March to investigate the assault and Guy’s subsequent death.
Mark Haymes on Tuesday joined police to call for anybody who had information about his brother’s death to come forward.
“It’s been pretty hard, just not knowing what happened that day and why someone would actually want to hurt (Guy),” he said.
Police arrested a 41-year-old man about 7pm yesterday in Greenacre.
He was taken to Bankstown Police Station and charged with murder, detainment to obtain advantage and detainment causing actual bodily harm.
He was refused bail to appear before Parramatta Local Court today.