Jeremy Giambi, a former major league outfielder and first baseman, died at his parents' home in Southern California on Wednesday at the age of 47.
Authorities told TMZ, it appears Giambi died by suicide.
Giambi played six seasons in the majors, including with his older brother, five-time All-Star Jason Giambi, on the Oakland A's in 2000 and 2001.
He also had stints with the Kansas City Royals, Phillies, and Boston Red Sox.
In March 2005, Giambi told The Kansas City Star that he had knowingly used steroids during his playing career, becoming one of the first notable major leaguers to make that admission.