Weiland was 48.
The night of his death, the singer had been scheduled to perform in Minnesota his new band, Scott Weiland & The Wildabouts.
Police in Bloomington, Minnesota released this statement, "On December 3rd, 2015, at 8:22 pm, Bloomington Police Officers responded a hotel in the 2200 block of Killebrew Drive on a report of an unresponsive adult male in a recreational motor vehicle. Officers arrived and determined the adult male was deceased. Identification of the deceased adult male is being withheld pending further investigation. Additional details regarding identity will be provided by the Hennepin County Medical Examiner’s Office at a later time."
Weiland, who was famous for his flashy on-stage performances, formed Stone Temple Pilots with friends more than two decades ago, and they released their first album, "Core," in 1992.
The father of two children with his ex-wife, Mary Forsberg, Weiland married photographer Jamie Wachtel Weiland, in 2013.
"She's the greatest thing that's happened to me in a long, long time," he once told Rolling Stone of his spouse.
Earlier this year, Weiland released his first album, "Blaster," with The Wildabouts. He wrote on Facebook that the band's tour in support of the album would be "a rebirth."