Roberto Agustín Miguel Santiago Samuel Trujillo Veracruz (/truːˈhiːjoʊ/; born October 23, 1964)[1] is an American musician who has been the bassist for heavy metal band Metallica since 2003.

After leaving Suicidal Tendencies, he performed with Ozzy Osbourne, Jerry Cantrell, and heavy metal band Black Label Society.

Roberto Agustín Miguel Santiago Samuel Trujillo Veracruz[2][3] was born in Santa Monica, California, on October 23, 1964.

[6] Trujillo gained prominence when he replaced Bob Heathcote as the bassist for California crossover thrash band Suicidal Tendencies.

Concurrent to his work with Suicidal Tendencies, Trujillo is a member of the band's side project, Infectious Grooves, along with vocalist Mike Muir.

In contrast to his earlier jazz and funk inspired playing, Osbourne's band was more straightforward hard rock and metal.

[9] During this time, Trujillo formed an experimental supergroup, Mass Mental, with then Dub War singer Benji Webbe, whose "ragga-punk-metal" outfit had just disbanded.

[10] Zakk Wylde, a personal friend and bandmate from the Ozzy days, recruited him to play with Black Label Society for a few shows.

His audition and hiring as well as his million dollar payment offer appeared in the documentary film Metallica: Some Kind of Monster.

Inspired by an article by Pino Palladino, he developed this during the recording sessions for Jerry Cantrell's Degradation Trip, which, according to Trujillo, had him working from "little hoodrat demos" with nearly inaudible bass.

[22] He often plays Fernandes Gravity 5-string basses, particularly a model with a silver finish, blue flame decals, and EMG pickups.