According to the AP, Plitt — the star of Bravo's Work Out and a new show called Friends to Lovers — was being videotaped by two men on the tracks of the Burbank station when he was struck by a Metrolink train.
While investigators have ruled out a suicide, they are still attempting to figure out who directed Plitt and his crew to film in what was a "restricted" area of the tracks.
Johnson said it appeared that Plitt thought a train was on a different track when he was accidentally hit. "It's like a blind turn," Johnson told the AP on Monday. "When the train came, you might not be able to tell which set the train is on."
Metrolink spokesperson Scott Johnson told the AP that the transportation system tries to warn those who post multimedia of themselves on its tracks. A recent motivational clip featured the body builder working out on the tracks as a train rushed by.
Burbank Police Department Watch Commander Scott Meadows told ABC News that the cameras have been seized as evidence. He added: "We do require film permits if you're outdoors, but there was no permit on file."
There were roughly 185 people on the train when the collision occurred. The fitness expert was pronounced dead at the scene of the tragedy, which took place shortly after 4 p.m. PT.
Bravo mourned Plitt's passing on Sunday, tweeting: "This is a terrible tragedy. Our thoughts and deepest sympathy are with Greg Plitt's family and friends at this extremely difficult time."
Bravo executive and long-running host Andy Cohen also tweeted about the loss. "We couldn't take our eyes off Greg Plitt after we cast him on 'Work Out,'" Cohen wrote. "[He] was as nice as he was beautiful. Seemed invincible, like Superman.