Miller's death was confirmed Friday by his agent, Matt Sosnick. Miller's body was found Wednesday night, but the cause of death hadn't been released by the Pinellas County Sheriff's Office.
Miller pitched for the Blue Jays, Marlins, Giants and Dodgers from 2002 to 2010. He had a career record of 24-14 in 216 games.
The California native lived in Palm Harbor since 2002.