Bravo star Greg Plitt was killed on Saturday in California.

The 37-year-old "Work Out" star was struck by a Metrolink train in Burbank at about 4 p.m., according to Variety.

The former Calvin Klein model had a camcorder in his hand and was with his friends at the time.

"He had on all black," a passenger on the train said to KABC, reports Variety. "The train went by. I saw him stumble over the tracks. He had a camcorder in his hand."

TMZ was told by officials that Plitt may have been working on shooting an exercise video at the time of the incident, which is now under investigation.

On top of being a reality star and model, Plitt was also an actor. He was in a few commercials for ESPN, Under Armour and Bowflex. And he had a small part in the 2013 movie "Grudge Match," which starred Sylvester Stallone and Robert De Niro.

He will be featured in an episode of the upcoming Bravo show, "Friends to Lovers." His appearance will air on Jan. 19.

Plitt's website describes his entrepreneurial efforts.

"In addition to his modeling and acting career, Plitt has launched many successful businesses," the biography section reads. "As a serial entrepreneur, Plitt's initiatives have turned into numerous products that net over millions each. Two products launching later in 2014 are Metaball, a multi-functional exercise and body transforming tool touted as "An Entire Gym in A Ball" and Whey Up, a protein and energy packed beverage supplement."

The fitness instructor last updated his Twitter account on Jan. 17, when he encouraged followers to visit his website. He explained he had been working on it for the past four months.

Before that, he hadn't tweeted since mid-December.