Glendale police Sgt. Jay O'Neill said Jason Ash was found lifeless Saturday evening with multiple cuts to his body and a cord around his neck.
A 16-year-old girl, who was also inside the apartment at the time Ash's body was found, was arrested and booked on second-degree murder charges. It is unknown if she will be charged as an adult.
O'Neill said the teen told authorities the pair was involved in a "consensual sex act involving strangulation," and when things went wrong, the girl called her mother.
The woman called authorities then began to provide life-saving care to Ash, according to O'Neill.
As the teen's mother was attempting to save Ash, the girl reportedly fled the scene. During the course of the investigation, she was found in a neighboring apartment and was taken into custody without incident.
No charges have been filed against the mother, said O'Neill, but the investigation is ongoing.
The mother, who did not want to go on camera, told ABC15 Monday evening that her daughter suffers from schizophrenia and autism.
She indicated her daughter was "really confused and does not understand what happened."