Maddie, a local reporter investigating a series of killings targeting similar looking women is caught off guard when her younger sister Olivia, is attacked in her own home. Urging on the side of caution, Maddie suggests they take a self-defense course. When Olivia starts to fall for their instructor, Maddie becomes skeptical when he refuses to reveal anything about himself, and tries to intervene before the relationship turns into a deadly obsession.
Unfortunately the movie My Sister's Serial Killer Boyfriend is not yet available on Disney Plus.
| Crew | Jasi Cotton Lanier | Stunt Coordinator |
| Directing | Danny J. Boyle | Director |
| Writing | Andrea Shawcross | Writer |
| Sound | Steve Gurevitch | Original Music Composer |
| Editing | Andrew Harwood | Editor |
| Costume & Make-Up | Taylor Jones | Costume Design |
| Production | Elle Sunkara | Line Producer |
| Production | Jeff Hardwick | Casting |
| Production | Joseph Wilka | Co-Producer |
| Camera | Robert Vardaros | Director of Photography |
| Production | Elle Sunkara | Co-Producer |
| Production | Sheri Reeves | Co-Executive Producer |
| Art | Jeremiah Mann | Set Decoration |
| Costume & Make-Up | Haley Stefancis | Makeup Department Head |
| Production | Ken Sanders | Producer |
| Costume & Make-Up | Melody Kelly | Hairstylist |
| Costume & Make-Up | Dana Kelly | Hair Department Head |
| Writing | Bryan Dick | Writer |
| Costume & Make-Up | Cheridan Smith | Makeup Artist |
| Production | Timothy O. Johnson | Executive Producer |
| Art | Jason Cronburg | Production Design |
