The Los Angeles County Medical Examiner determined former MLB outfielder Jeremy Giambi died by suicide, according to USA Today's Gabe Lacques.
The coroner listed a gunshot wound to the chest as Giambi's cause of death.
Giambi's agent confirmed the 47-year-old died Wednesday at his parents' home in Claremont, California.
Giambi spent six years in MLB across spells with the Oakland Athletics, Kansas City Royals, Philadelphia Phillies and Boston Red Sox. The bulk of his career came in Oakland, where he appeared in 270 games.
"We are heartbroken to learn of the passing of a member of our Green and Gold family, Jeremy Giambi," the Athletics said in a statement.