The L.A. County Coroner's office confirms to ET that a contestant who participated in the reality series "Wipeout," Tom Sparks, has died. A source tells ET the 33-year-old was admitted to the hospital approximately two weeks ago after complaining of knee pain during the taping of the popular ABC show.

ABC and the company that produces "Wipeout," Endemol, released a joint statement to ET: "We offer our heartfelt condolences to the family. This is a tragic loss and our thoughts are with them at this time."

According to the Idaho Mountain Express, Tom's father Bill Sparks says doctors think Tom's stroke was likely caused by a pre-existing disease that causes unnatural blood clotting called antiphospholipid antibody syndrome (APS).

A source close to the "Wipeout" production tells us that approximately two weeks ago, Sparks was complaining of knee pain on the first part of the show's obstacle course, and the producers told him to stop. As the medics checked him out they noticed he was experiencing shortness of breath, and he went to a local hospital for further examination.

The L.A. County Coroner's office tells ET that the date of Sparks' death was Thursday, Nov. 5 in Los Angeles. They are deferring the cause of death pending additional tests, and the coroner's report could take up to four-to-ten weeks to be released.

Prior to moving to California, Sparks worked as a morning-show disc jockey. He is survived by his wife Kate.