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He played eight seasons with the Raiders and was once considered one of the top-two corners in the league.
But he'll probably be best remembered for his flameout in Philadelphia. Asomugha was the biggest free agent in the summer of 2011, and signed a five-year, $60 million contract with the Eagles.
After the team missed the playoffs both years and his performance slipped, he was cut in February of 2013 - nullifying the bulk of that five-year deal. Since the NFL can cut players without honoring the remainder of their contracts, Asomugha ended up earning about $25 million of that $60 million deal, according to USA Today.
He signed a one-year contract with the 49ers this season, but was cut in November.
He's retiring as an Oakland Raider.
His post-football prospects look promising. He's considered one of the more intelligent players in the league. He's also married to actress Kerry Washington, who is currently expecting a baby.