A Los Angeles Police Department source told People that the cause of death is unclear.

Although Gesser didn't have a character named after him in "Wolf on Wall Street," the former hedge-fund manager served as an advisor to Belfort in real life. He also served as a consultant to director Martin Scorsese and actor Jonah Hill in the 2013 film.

"Wolf of Wall Street" starred Leonardo DiCaprio as Jordan Belfort, an infamous stockbroker involved in the "pump and dump" fraud scheme.

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“Jon (Abercrombie) and I were fast friends, running and biking and going to music events together," musician and songwriter Lindy Hearne (left) said. "He was one of my best friends, but I think everyone who knew Jon felt that he was their best friend.” (Courtesy of Lynn Adler)

Credit: Lynn Adler

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A MARTA operator is seen inside the control room of one of the new MARTA trains during the unveiling of these trains on Thursday, Jan. 30, 2025. (Miguel Martinez/AJC)

Credit: Miguel Martinez-Jimenez