Marinelli, 56, started his coaching career as the defensive line coach at Utah State from 1976-81 and held coaching positions at California, Arizona State and Southern California before moving to the NFL's Tampa Bay Buccaneers in 1996.
Mariucci was fired in late November after a 4-7 start, and former Chicago Bears head coach Dick Jauron, a Lions' assistant coach, filled in on an interim basis. Detroit ended the season with a disappointing 5-11 record.
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