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Kim Delaney to star in Lifetime's 'Long Island Serial Killer' movie

Kim Delaney plays Mari Gilbert in the Lifetime

Kim Delaney plays Mari Gilbert in the Lifetime movie "The Long Island Serial Killer," set to premiere in winter 2021. Credit: Getty Images for DirecTV/Michael Loccisano

"NYPD Blue" Emmy Award winner Kim Delaney will star as Mari Gilbert, mother of slain sex worker Shannan Gilbert, in a TV movie about Long Island's Gilgo Beach murders.

Lifetime announced Thursday that "The Long Island Serial Killer: A Mother's Hunt for Justice," is scheduled to premiere in winter 2021. Katharine Isabelle will play Shannan Gilbert in the telefilm, for which broadcast journalist Deborah Norville is an executive producer. Mari Gilbert pushed police to investigate her daughter's disappearance, which then led to the discovery of 10 sets of human remains on Gilgo Beach. Police believe the killings may have been the work of one or more serial killers. Shannan Gilbert’s body was found in nearby Oak Beach in December 2011; investigators eventually ruled that her death was unrelated to the serial murders.

Amy Ryan portrayed Mari Gilbert — who was fatally stabbed in July 2016 — in this year's Netflix movie "Lost Girls."

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