Fitness model and television actor George Plitt Jr., also known as Greg Plitt, died at the age of 37 after he was hit by a train while filming on the tracks in Burbank, California, on Saturday, police said Sunday. Three other people were reportedly with Plitt when he was struck by a Metrolink passenger train and was declared dead at the scene.

Authorities ruled out suicide in the incident and an investigation is underway to determine who instructed them to film on a restricted area on the tracks, Burbank Police Sgt. Scott Meadows told The Associated Press. Police reportedly said that the other men, who were filming Plitt, were not injured in the incident. A fellow model said that Plitt was filming an advertisement for a protein shake, according to Mirror Online. However, police reportedly said it was unclear what they were filming.

"This is a very sad tragedy," Bravo network wrote on its Twitter account. "Our thoughts and deepest sympathy are with Greg's family and friends."

Plitt, who was born in Baltimore, starred in Bravo’s shows, “Work Out” and “Friends to Lovers,” and had also appeared in over 200 fitness magazine covers. He also starred in movies including "Terminator Salvation" and "Watchmen."

The train, which was on the railroad track north of the Burbank train station, was blowing its horn, but Plitt may have believed that it was on a parallel track, Meadows reportedly said.

"It's like a blind turn," Meadows said, according to AP. "When the train came, you might not be able to tell which set the train is on."

Here are some tributes from fellow models and stars remembering Plitt on Twitter.