Police said at least 20 gunshots were fired in what appears to be a retaliation shooting, but the details are unclear.
Ten men reportedly pulled their guns on each other during the incident.
"We had two police officers in the area of Fourth Street and Grant when they heard roughly 20 shots," said Phoenix Police Sgt. Alan Pfohl. "Officers responded to an event that was taking place there, and when they came upon the event, they saw several people leaving in a hurry."
Two men had been shot.
A 53-year-old man did not survive.
A 40-year-old man suffered non-life-threatening injuries.
"At this point in the investigation, we don't know if it is rival members; we don't know if it was just two people having some type of altercation," said Pfohl.