Prosecutors say Dallas Cowboys defensive tackle Josh Brent has tested positive for marijuana while awaiting trial for a deadly car crash.

In a motion filed Thursday, Dallas County prosecutors asked a judge to revoke Brent's $100,000 bond after he failed a urine test taken last month.

Brent is charged in the Dec. 8 car crash that killed Jerry Brown, a Cowboys practice squad player. Police have accused Brent of driving with a blood-alcohol content more than twice the legal limit.

A hearing on the prosecutors' motion has not been scheduled. Brent's attorney, George Milner, did not immediately return a phone message.