"Rene Angelil, 73, passed away this morning at his home in Las Vegas after a long and courageous battle against cancer," the rep said in a statement. "The family requests that their privacy be respected at the moment."
Angélil, who guided Dion's career as her manager and mentor, is survived by the couple's three children – René-Charles, 14, and 5-year-old twins Nelson and Eddy – as well as Anne-Marie, Patrick and Jean-Pierre, his adult children from previous marriages.
"Mr. Angelil, 73, died of throat cancer at his home in Henderson while under the care of a physician," the Clark County Office of the Coroner/Medical Examiner said in a statement to PEOPLE.
The coroner's office added that Angélil's death was due to natural causes and no further investigation into his death was expected.
Born in Montreal, Angélil began his career as part of the Canadian pop rock group The Baronets in the 1960s. While the group had a modest number of hits, they eventually broke up and Angélil found success as a music manager.