The Long Island Serial Killer: A Mother’s Hunt for Justice tells the story of Mari Gilbert’s search for the truth behind what happened to her daughter Shannan, a sometime escort who disappeared after a ‘date’ on Long Island. After Shannan (Katharine Isabelle, Hannibal) fails to come home, her mother Mari (Kim Delaney) knows something is terribly wrong. Pleading to police to take her concerns seriously, she keeps pushing the police for answers. Mari’s insistence that her daughter not be overlooked eventually leads to a horror hidden on Long Island for more than a decade – 19 bodies of young women discovered buried in shallow graves along Ocean Parkway in the area of Jones Beach State Park.
Unfortunately the movie The Long Island Serial Killer: A Mother's Hunt for Justice is not yet available on HBO Max.
| Writing | John Pielmeier | Writer |
| Directing | Stanley M. Brooks | Director |
| Production | Stanley M. Brooks | Executive Producer |
| Production | Deborah Norville | Executive Producer |
| Art | Rosaura Lezama | Production Design |
| Art | Erica Lapadat-Janzen | Art Direction |
| Costume & Make-Up | Patricia J. Henderson | Costume Design |
| Production | Gia Ghadimian | Associate Producer |
| Production | Elizabeth Stephenson | Executive Producer |
| Production | Kevin Leeson | Producer |
| Production | Shawn Williamson | Producer |
| Production | Jamie Goehring | Producer |
| Crew | Mark Sweatman | Stunts |
