McMackin coached extensively at both the collegiate and professional levels. At the professional level, McMackin coached for two
National Football League teams: as defensive coordinator for the
Seattle Seahawks from 1995 to 1998, and as linebackers and assistant head coach for the
San Francisco 49ers from 2003 to 2005. He also coached for the
Denver Gold of the defunct
United States Football League (USFL). At the college level, McMackin gained prominence as the defense coordinator for the University of Miami for the 1993 and 1994 seasons. There, Miami won two Big East Championships and ranked first in total defense, scoring defense and pass defense. Further, the Hurricanes allowed just seven touchdowns on defense in one season. On August 1, 2009 McMackin was suspended for 30 days without pay due to his use of a homophobic slur during an interview. McMackin resigned from his position of head coach for Hawaii on December 5, 2011, accepting a $600,000 buyout. ==Personal life and death==