Charles Bohl, a screenwriter whose credits include the 2002 Fox thriller Swimfan and Lifetime’s Martha Behind Bars, died April 18 of a heart attack, a friend confirmed to Deadline.

After relocating to Los Angeles in his 20s, Bohl scripted the 1987 farce He’s My Girl starring T.K. Carter and David Hallyday. He’d go on to write Swimfan, the 2002 psychological thriller starring Jesse Bradford and Erika Christensen in the creepy tale of a high school swimming star whose one-night stand fuels a nightmarish obsession.

Bohl then wrote Martha Behind Bars, the 2005 Lifetime telefilm about the incarceration of the lifestyle maven, on which he also was co-producer. His credits also include TV movies Cheerleader Camp (2007), which he also executive produced, and Unstable (2009).

Known to friends as Charlie, a regular at the Hollywood YMCA, Bohl is survived by his mother and sisters.