Celine Dion's husband's long battle with cancer ended Thursday morning ... he died at their home in Las Vegas.
Rene Angelil was diagnosed with throat cancer in 1998. His health got so bad last year that Celine took a leave of absence from her Las Vegas show to take care of him.
Sources close to Celine tell us Rene's death was completely unexpected because recently he's felt much better. In fact, we're told he and Celine had planned business meetings together for today.