Robert Wallace, from Glendale was found in the backyard of the residence and taken into custody. The victim was transported to University of Arizona Medical Center for treatment.
Detectives found that family members and neighbors had come together for a party at the home. In the early morning hours, an argument erupted between two male guests. At one point during this argument 37-year-old Wallace, produced a handgun and fired a round at the victim. The bullet struck the victim in the head causing a non-life-threatening injury.
Detectives arrested Wallace for one count of Aggravated Assault With a Deadly Weapon. He was booked into the Pima County Adult Detention Center.