Walter, a third-round draft pick in 2005 who has been primarily a backup during his four-year NFL career, practiced with the Raiders on Thursday morning but was noticeably missing from the afternoon workout.
A few reporters bumped into Walter shortly after the afternoon practice started and he confirmed that he had been released.
The move comes as no surprise. Walter did not take part in any of the team's voluntary offseason workouts and has been seeking a trade for some time.
By releasing Walter, the Raiders also cleared up a roster spot for first-round pick Darrius Heyward-Bey, who has reportedly agreed to terms on a contract.
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