Kyle Boller NFL career over after one day in San Diego

Just a day after Kyle Boller was signed by the Chargers, he has retired from football according to the San Diego Union Tribune. The Chargers signed the 8-year vet to replace backup Charlie Whitehurst who injured his knee on the first day of training camp. No word on exactly what prompted Boller's sudden retirement.

The journeyman QB played the past two seasons in Oakland where he was the primary backup to Jason Campbell until Campbell went down with a broken collarbone. The team acquired Carson Palmer in trade with the Bengals just two days later but Boller was given his first start for the team to give Palmer time to acclimate to his new team.

Boller played a little over a half of football and threw three interception before he was yanked in favor of Palmer who had been with the team all of five days. That apparently will be Boller's lasting memory as it was the final time he played in an NFL game.

Boller was originally drafted out of Cal in the first round of the 2003 draft by the Baltimore Ravens. He only started one full season for the Ravens and has a career QB rating of 69.5.