Kyle Boller, who signed with the San Diego Chargers on Friday, apparently decided his heart wasn't in it as he reportedly retired Saturday. The Chargers had signed Boller because backup Charlie Whitehurst is out with a knee injury. The Union-Tribune reported Saturday that he had changed his mind and decided to retire after eight seasons. Boller was the 19th pick in the 2003 draft by Baltimore. He was 20-27 in 47 starts and completed just 56.7 percent of his passes, with 48 touchdown passes and 54 interceptions. He also played for the St. Louis Rams (2009) and Oakland Raiders (2010-11).