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Former Dallas Cowboys running back Marion Sylvester Barber III was found dead in his Frisco, Texas apartment on Wednesday, June 1. The cause of death is not known. He was 38.

Police conducted a welfare check after a report of a water leak at the residence. Officers forced their way into the apartment and discovered the body.

“Frisco Police responded to a welfare concern at an apartment believed to be leased by Marion Barber,” police spokesperson Joshua Lovell said.

The Collin County Medical Examiner’s Office also responded “to the location to investigate an unattended death,” authorities confirmed.

The Cowboys announced Barber’s death in a statement on Wednesday:

“We are heartbroken by the tragic death of Marion Barber III. Marion was an old school, hard-nosed football player who ran with the will to win every down. He had a passion for the game and love for his coaches and teammates. Our hearts go out to Marion’s family and friends during this difficult time.”

Barber was drafted by the Dallas Cowboys in the fourth round of the 2005 NFL Draft. He played six years in the NFL between 2005 and 2011.

He was a Pro Bowler in 2007 and last played for the Chicago Bears in 2011. His father was Marion Barber, Jr., a running back who played for the New York Jets from 1982 until he retired in 1988.