Stanford, Calif. ? Chester McGlockton, a four-time Pro Bowl defensive lineman who emerged as a talented assistant coach and mentor at Stanford, died Wednesday. He was 42.

Stanford said the school’s defensive assistant died overnight. The cause of death was not immediately announced.

A native of Whiteville, N.C., McGlockton starred at Clemson before being selected 16th overall by the Los Angeles Raiders in 1992. He played 12 seasons in the NFL with the Raiders, Kansas City Chiefs, Denver Broncos and New York Jets. He made all four of his Pro Bowl appearances while with the Raiders from 1994-1997.