Prolific independent film producer Robert F. Newmyer has died in Toronto while supervising the production of "Breach" at age 49.

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Newmyer suffered a heart attack brought on by an asthma attack while working out in a Toronto gym Monday, the Los Angeles Times reported Wednesday.

The Washington native was a partner in Outlaw Productions and had more than two dozen film credits including the indie hit "sex, lies and videotape," Denzel Washington's "Training Day" and Tim Allen's "The Santa Clause" movies.

His most recent projects were the comedy "The Santa Clause 3" and "Breach," starring Chris Cooper and Ryan Phillippe, about an FBI agent who suspects his boss is a security risk.

One of his projects in development at the time of his death was "The Lost Boys of Sudan," about a group of boys who marched across their country in an effort to escape the violence there. He became a personal advocate for the refugees and even took them into his home.

Newmyer is survived by his wife, Deborah, four children, his parents and two sisters.