Marie Osmond's 18-year-old son Michael Blosil has died, a family spokesman said Saturday.

"My family and I are devastated and in deep shock by the tragic loss of our dear Michael and ask that everyone respect our privacy during this difficult time," the entertainer said in a statement through spokesman Alan Nierob.

Brian Elias of the Los Angeles Coroner's Office said the death is under investigation.

Her Web site, written last September, describes her as "the proud mother of eight beautiful children who are always her greatest treasures."

Marie Osmond and her brother Donny hosted the national television variety show "The Donny & Marie Show" from 1976 to 1981.

Afterward, she had acting and singing careers. She recently competed in a season of "Dancing With the Stars."

In 2001, she wrote "Behind the Smile," about her experience with postpartum depression.