01/03/2013 07:13 EST | Updated 03/05/2013 05:12 EST

Autopsy says Cowboys player killed in crash died of head and neck trauma, wasn't drunk

DALLAS - An autopsy has found that Dallas Cowboys practice squad player Jerry Brown Jr. was sober when he was killed in a crash that led to an intoxication manslaughter charge against the teammate at the wheel.

The Dallas County Medical Examiner's Office reported Thursday that Brown died of head and neck trauma when their vehicle overturned. He had a dislocated neck, a severely bruised spine and a blood alcohol content of 0.056 per cent. That's well below the Texas drunken driving standard of 0.08 per cent.

Police have said Cowboys nose guard Josh Brent, who was driving, had a blood alcohol level twice the legal limit when after the Dec. 8 crash in Irving, a Dallas suburb. He remains free on US$100,000 bond.

Police say neither man was wearing a seatbelt.