LOS ANGELES — Southern California secondary coach Rocky Seto was promoted to defensive coordinator Wednesday.

USC also announced former Houston Texans defensive line coach Jethro Franklin will return to the Trojans as defensive line coach, and linebacker coach Ken Norton was promoted to assistant head coach for the defense.

Seto, 32, has spent his entire coaching career at USC, beginning in 1999 after playing for the Trojans. He began as a volunteer assistant in 1999. He worked with Trojans safeties in 2003, the linebackers in 2004-05 and the secondary the past three seasons.

Franklin, 43, was defensive line coach for USC in 2005 when the Trojans won the national championship. He went on to coach the defensive lines with the Tampa Bay Buccaneers in 2006 and the Texans in 2007-08. He coached at his alma mater, Fresno State, from 1991-98. He spent the 1999 season at UCLA before heading to Green Bay to coach the Packers defensive line from 2000-04.

Norton, 42, has been working with Trojans linebackers the past five seasons. He played at UCLA and with the Dallas Cowboys and San Francisco 49ers.