Proof was himself shot and killed shortly after during the incident last week at Detroit’s CCC Club (April 11).
Keith Bender, an army veteran, had been in a critical condition since being shot in the head.
According to police, witnesses reported that Proof shot Bender during a dispute and was then shot himself by Bender’s cousin Mario Etheridge.
Etheridge has been charged with discharging a firearm in a building and carrying a concealed weapon, BBC News reports. He has pleaded not guilty to both counts.
A spokeswoman at Detroit’s St John Hospital and Medical Center has said that Bender died from a gunshot wound early yesterday morning (April 18).
“He will be missed as a friend, father and both the heart and ambassador of Detroit hip-hop,” said the rapper.
“Proof was funny, he was smart, he was charming. He inspired everyone around him.”
The late rapper’s lawyer last week hit out at police claims that it was Proof who fired first in the incident.
David Gorosh told the Detroit Free Press: “To indicate that Proof pulled the trigger first is reckless and quite frankly will be proved to be untrue… There are ways to determine what shots were fired and by whom. There’s an ongoing investigation… Until all of the factual evidence has been evaluated, an opinion by the Detroit Police Department is premature.”