DETROIT -- The Detroit Lions reportedly fired Mike Martz on Wednesday, ending his fractious two years as the team's offensive coordinator.
Martz will be replaced by Jim Colletto, who will retain his position as offensive line coach while calling plays. Receivers coach Kippy Brown will serve as co-coordinator, the Detroit Free Press, Booth Newspapers and ESPN.com reported and NFL Network's Adam Schefter confirmed.
A message seeking comment was left Wednesday with Martz's agent, Bob LaMonte. The Lions had no comment on the reports, a team spokesman said.
Martz confirmed his firing to the Free Press.
"We fell short of what we wanted to do offensively, and I regret that," he told the newspaper.
During two losing seasons in Detroit, Martz was unable to replicate the success he had during the "Greatest Show on Turf" years in St. Louis.
The Rams fired Martz on Jan. 2, 2006, the day after St. Louis finished 6-10. He sat out the last 11 games recovering from endocarditis, a bacterial infection of a heart valve.
Information from the Associated Press was used in this report