During an interview on the episode of "The Oprah Winfrey Show" that aired Thursday, Osmond says her son, Michael Bryan, didn't show his depression.
She says he had a difficult childhood and started to use drugs when he was about 12, but that he wasn't using drugs at the time of his death.
The 18-year-old college student jumped from the eighth floor of an apartment building in Los Angeles in February. The coroner ruled the death a suicide.
Osmond returned to work within a couple of weeks. She told Winfrey the stage was her safe place.