Scott Weiland, whose mercurial vocal style was a signature of the rock band he helped start, Stone Temple Pilots, and later of the band Velvet Revolver, died on Thursday in Bloomington, Minn. He was 48.

His manager, Tom Vitorino, confirmed the death. A statement posted to Mr. Weiland’s Facebook and Instagram pages said he died in his sleep while on tour stop with his band the Wildabouts.

The Wildabouts had been scheduled to perform Thursday night in Medina, Minn., at the Medina Entertainment Center.

Mr. Weiland released one album with the Wildabouts, “Blaster,” this year, and the band was near the end of a fall tour of clubs and small theaters. But at the height of Stone Temple Pilots’ fame in the 1990s, he was known for commanding large stages with one of his signature moves: shouting lyrics through a megaphone held up to his microphone.

Stone Temple Pilots was formed by Mr. Weiland with brothers Dean and Robert DeLeo, on guitar and bass, and the drummer Eric Kretz in the late 1980s in California.

The group was initially dismissed by critics as a knockoff of popular Seattle-based acts like Pearl Jam, but it found a large fan base with broody melodies and memorable riffs. It was later credited with introducing the stadium-rock ambitions of ’70s bands to grunge. And it was Danny Goldberg, Nirvana’s former manager, who signed Mr. Weiland’s band to Atlantic Records in 1992.

In September 1992 Stone Temple Pilots released its first studio album, “Core,” which included the hits “Plush” and “Creep.” The band’s second album, “Purple,” released two years later, contained “Vasoline” and “Interstate Love Song.” Together, the two records sold 14 million copies in the United States, and “Plush” earned a Grammy for best hard rock performance in 1994.

The band released three more albums before going on hiatus in 2001; it reunited and released a self-titled album in 2010.

Three years later, the group parted ways with Mr. Weiland, posting a brief message on the band’s website that said he had been “officially terminated.”

Mr. Weiland, who struggled with drug addiction, was often seen as defiant and bedraggled, but also as a capable vocalist with a gruff, powerful tone. He had said in interviews that he had been given a diagnosis of bipolar disorder.

In 1995, he was arrested on suspicion of possessing cocaine and heroin and completed a rehabilitation program. In 1996, he entered rehab again, forcing the band to cancel a tour supporting the album “Tiny Music … Songs From the Vatican Gift Shop.”

“It got to the point where I didn’t feel like I got a good enough rush unless I had one hand on the needle and one hand dialing 911,” he told Rolling Stone in 1997.

Two years later, he was sentenced to a year in jail for violating probation that resulted from a 1998 arrest for heroin possession.

Mr. Weiland released his first solo album, “12 Bar Blues,” in 1998 and its follow-up, “ ‘Happy’ in Galoshes,” a decade later. He also released a holiday album, “The Most Wonderful Time of the Year,” in 2011.

But Mr. Weiland’s greatest fame outside Stone Temple Pilots was found with Velvet Revolver, a band consisting of three former members of Guns N’ Roses — Slash, Duff McKagan and Matt Sorum — and the guitarist Dave Kushner.

The group’s 2004 debut, “Contraband,” reached No. 1 on the Billboard album chart and included two gold-selling singles, “Slither” and “Fall to Pieces.” “Slither” also received a Grammy for best hard rock Performance in 2005.

But Mr. Weiland’s time in Velvet Revolver also ended in chaos. In 2008, the band dismissed him, releasing a statement that said Mr. Weiland’s “increasingly erratic onstage behavior and personal problems” were partly to blame.

Mr. Weiland was born Scott Richard Kline on Oct. 27, 1967, in San Jose, Calif. His parents divorced when he was 2 years old, and his mother, Sharon, married David Weiland, who formally adopted him.

The family moved to Ohio, and in his 2011 memoir, “Not Dead & Not for Sale,” Mr. Weiland disclosed that he had been sexually abused when he was 12 years old by a “muscular” high school senior.

The family moved back to California when Mr. Weiland was a teenager. He said that he had difficulty fitting in at his new high school, and that he started experimenting with drugs and alcohol after playing varsity football.

At 16, he started his first band. He met Robert DeLeo at a concert; Dean DeLeo arrived in 1989, and the group finalized its lineup with Mr. Kretz.

Mr. Weiland married his first wife, Janina Castaneda, in the ’90s. After their divorce, he was married to the model Mary Forsberg from 2000 to 2007; the couple have two children, Noah and Lucy. He married the photographer Jamie Wachtel in 2013.

Complete information on survivors was not immediately available.

Mr. Weiland was remembered on social media by a number of his contemporaries, including Krist Novoselic of Nirvana, the singer and songwriter Ryan Adams and the guitarist Dave Navarro. “It’s not my loss,” Mr. Navarro wrote, “it’s our loss.”

CREDIT: By KENNETH ROSEN and CARYN GANZ for the NEW YORK TIMES