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Currently you are able to watch "My Sister's Serial Killer Boyfriend" streaming on Hoopla, Lifetime, Lifetime Movie Club Apple TV Channel, Lifetime Movie Club Amazon Channel. It is also possible to buy "My Sister's Serial Killer Boyfriend" on Amazon Video, Vudu, Microsoft Store as download or rent it on Amazon Video, Vudu online.
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.