Wright, 20, of Pittsburgh was found shot in a parking lot on Oakland Avenue in Indiana about 4 a.m. Oct. 17, police said at the time.
Initial investigations led police to believe four people conspired to rob Wright of a large quantity of marijuana, which led to the shooting.
According to police, the four people fled following the incident at the Carriage House East apartment complex.
Three of them were arrested earlier:
• Isabella Marie Edmonds was 17 when she arraigned Oct. 17 on multiple charges of homicide and robbery and two counts of criminal conspiracy. Edmonds, who turned 18 Oct. 24, was charged as an adult. She was found walking along Oakland Avenue following the incident.