Browns running back Jamal Lewis was placed on injured reserve Wednesday night with what the team called ''post-concussion symptoms,'' ending the 10-year veteran's career.
Apparently Lewis suffered a head injury in last week's game at Cincinnati. He was not in the locker room or at practice Wednesday.
Lewis, 30, said on Nov. 1 at Chicago that this will be his final season. The Browns are 1-10 going into Sunday's home game against San Diego.
Known as a punishing runner, Lewis missed two games earlier this year with a hamstring injury. He's managed 500 yards (3.5 average) and no touchdowns. His season-high came Oct. 11 at Buffalo, when he carried 31 times for 117 yards.
Lewis' numbers seem Hall of Fame-caliber. He stands 21st on the NFL's all-time rushing list with 10,607 career yards, just 37 yards out of 20th.
Playing nine seasons (with one on injured reserve), Lewis posted seven 1,000-yard campaigns. His 2,066 yards with Baltimore in 2003 still ranks as the second-highest single-season total in league history, trailing only Eric Dickerson's 2,105 with the L.A. Rams in 1983.
The fifth overall pick in the 2000 draft, Lewis played for Baltimore for seven seasons, then was lured as a free agent by then-Browns general manager Phil Savage to Cleveland in March, 2007.
''Jamal has been an integral part of this team and has exhibited a great work ethic,'' Browns coach Eric Mangini said in a statement. ''He worked hard, studied hard and set a good example for the younger running backs.''