Fitness expert and Bravo reality star Greg Plitt died Saturday after being struck by a train in Burbank, Calif., NBC News reports. He was 37.

Plitt was struck at about 4 p.m. Saturday on the train tracks north of the Burbank Metrolink Station, police told NBC. He was pronounced dead at the scene and police are investigating, but do not believe his death was a suicide, according to NBC.

Police told People that a camera was found near the scene and it appears that Plitt was filming something at the time of his death. (He had previously posted videos of himself working out on or near train tracks.)

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A former U.S. Army ranger who went on to work as a fitness instructor, model and motivational speaker, images of Plitt's body were used to create Dr. Manhattan's physique in the 2009 film Watchmen. Plitt appeared on Bravo's Work Out in 2008 and returned to the network this year for the reality show Friends to Lovers?, which premiered on Jan. 12.

After hearing of Plitt's death, Bravo's Andy Cohen tweeted Sunday that he viewed him "like Superman."