Metallica's Robert Trujillo said he was stunned by the death of Soundgarden frontman Chris Cornell. 

During a sit-down interview at Metallica's show in Houston on Sunday, June 11, Trujillo praised the singer as one of rock's greatest voices, sharing some personal insight into Cornell's disposition.

"I was really surprised by the loss of Chris Cornell, one of the ultimate voices in rock music, hands down," Trujillo said.

The Metallica bassist admitted he didn't know Cornell that well, but added that the times he did talk with him, he was "very reserved."

"One thing about people, especially creative people that can be reserved, you never know what's going on inside," Trujillo said, adding: "You never know what's going on inside."

Cornell was found unresponsive on May 17 following a show in Detroit, Michigan. Reports since then have revealed that his death was caused by hanging, and a toxicology report showed that the singer had several prescription drugs in his system.

You can listen to Trujillo's full statement on Chris Cornell's death in the video above, and my full interview with the rocker below.