What is the name of the bassist who replaced Jason Newsted in Metallica?

The bassist who replaced Jason Newsted in Metallica is Robert Trujillo. Newsted resigned from Metallica in 2001 after more than a decade with the band, creating the opening for a new permanent bassist.

Trujillo joined Metallica in 2003 after auditioning alongside several other musicians. Before Metallica, he was known for playing with Suicidal Tendencies and Infectious Grooves, and he had also worked with Ozzy Osbourne and Jerry Cantrell. His energetic fingerstyle playing and slap-bass technique made him stand out during the auditions.

A common mix-up is Mike Inez, who auditioned for Metallica and is associated with Alice in Chains and Ozzy Osbourne, but was not selected. Robert Trujillo first appeared on Metallica's St. Anger tour; producer Bob Rock played bass on the studio album itself. Trujillo later became the bassist on Death Magnetic and subsequent Metallica releases, making him the band's longest-serving bassist.