American musician who is the bassist for heavy metal band Metallica. He first rose to prominence as the bassist of crossover thrash band Suicidal Tendencies from 1989 to 1995, while also collaborating with Suicidal Tendencies frontman Mike Muir for funk metal supergroup Infectious Grooves. After leaving Suicidal Tendencies, he performed with Ozzy Osbourne, Jerry Cantrell, and heavy metal band Black Label Society. Trujillo joined Metallica in 2003 and is the band's longest-serving bassist. He was inducted to the Rock and Roll Hall of Fame as a member of Metallica in 2009.