Myles Gray had injected testosterone, doctor tells hearing into police-involved death

Mentz-Serfontein noted people often use testosterone for building excess muscle mass.

The hearing was called by the Office of the Police Complaint Commissioner of B.C. into the actions of several Vancouver police officers who had a violent encounter with Gray on that day in August 2015. Police were originally called to a complaint of a man who sprayed a woman with water from a garden hose.

Police told a coroner’s inquest in 2023 that Gray exhibited “superhuman strength” and was behaving in an “animalistic” way, and he didn’t appear to feel pain as they hit him with their batons and knees, punched him in the face and wrestled him to the ground.

Mentz-Serfontein told the hearing on Thursday that the steroids had caused Gray to have an elevated red blood cell count, and he told his patient that his use of the steroid could aggravate his bipolar disorder.

“On two occasions, I noted that I discussed with him about his use and potentially looking at cutting back, given his abnormal blood numbers,” he said.

When asked about changes to Gray’s mental well-being leading up to 2015, Mentz-Serfontein said the only documentation he had was of “one episode of depressed mood.”

“And from my interactions after that, there was no indication of him struggling from a mental health perspective,” he said.

On cross-examination, the physician testified that a concern with testosterone injections in someone with bipolar disorder was that it could destabilize their mood, make them more manic and increase aggression in someone displaying mania.

Gray’s family had sought the hearing after a discipline authority cleared seven officers of misconduct in 2024.

Later Thursday, RCMP Sgt. Robert Nash, who conducted a Police Act investigation of the officers involved in the death, was brought in to complete his cross-examination.

Nash was taken through some transcripts of police radio calls the day of Gray’s death, which included officers’ reports of Gray fighting back before he was brought into custody and handcuffed.

Const. Eric Birzneck’s lawyer Mike Shirreff then brought Nash to a 2017 report by a medical expert retained by B.C.’s police oversight authority, the Independent Investigations Office.

That report said Birzneck had attempted on two occasions to apply a vascular neck restraint on Gray, which Shirreff confirmed with Nash was “an approved use-of-force technique” at the Vancouver Police Department.

The report concluded the details in the arrest did not indicate that the use of such a restraint caused Gray’s death.

Shirreff then cited a separate 2017 report by a use of force expert, which also helped inform Nash’s investigation. The lawyer asked Nash whether he agreed that the expert’s opinion detailed in that report had been that “the actions of the officers did not fall outside the standards at the time.”

Nash replied that, to the best of his recollection, that was a fair characterization of the expert’s general findings in that report.

Birzneck and six other officers have denied misconduct in Gray’s beating death.

That coroner’s jury concluded that Gray’s death was a homicide after hearing that he died shortly after the beating by several officers, leaving him with injuries including a fractured eye socket, a crushed voice box and ruptured testicles.

The term “homicide” is used by the BC Coroners Service to classify a death resulting from injury intentionally inflicted by another person. It does not imply fault or blame.

This report by The Canadian Press was first published Feb. 26, 2026.

Brieanna Charlebois, The Canadian Press

by The Canadian Press

Myles Gray had injected testosterone, doctor tells hearing into police-involved death

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