Glendale police say they got a 911 call about a shooting at a home in the area at 8:45 a.m.
When they arrived, they were directed to a condo where they found a man with a gunshot wound inside.
Firefighters treated him, but he was eventually declared dead at the scene. He is reportedly in his 20s; no other information about his identity was released.
Witnesses told police a suspect had fled before they had arrived.
After officers began searching the area, police say the suspect and unknown man returned to the area in a vehicle.
Police detained both men. The suspect is still being detained for questioning.
Officers say the suspect and the victim knew each other, but they're still working on a possible motive.
This is a developing story. Stay with FOX 10 News for updates.