A medical investigation shows a Denver jail inmate suffocated from being restrained by sheriff's deputies, and the death is a homicide.

The Denver medical examiner's office said Friday that 50-year-old Michael Marshall died from "complications of positional asphyxia" after the Nov. 11 incident. The office says Marshall was restrained by deputies during an acute psychotic episode. His family removed him from life support nine days later.

Six deputies were put on restricted duty after the encounter. Denver sheriff spokesman Simon Crittle says police and prosecutors are still conducting a criminal investigation.

Marshall was arrested Nov. 7 on suspicion of trespassing and disturbing the peace at a motel where he had been staying.

The case comes as the department tries to make sweeping reforms after a series of excessive force and misconduct cases.