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Sister Regina

The sinister Sister Regina

Sister Regina (Concetta Tomei) is the villainess from "Sister Michael Wants You," the first season finale of Diagnosis Murder.

Sister Regina is a nun at Saint Clair's nunnery school, but she was also in league with the Strega crime family and the corrupt Councilman Fletcher. She shot and killed Greg Wilson, a cameraman who was recording a promotional video for the school, with the video most likely also containing incriminating evidence. The murder led to Sister Michael bringing in Mark Sloan to pose as a priest to investigate, but during their meeting with Steve Sloan in Sister Michael's office, Sister Regina figures out the ruse and has Mark and Steve thrown out, all the while berating Sister Michael for allowing men inside the school. Sister Regina's villainous reveal came when Mark and Sister Michael find the incriminating tape, as she pointed a gun at them and revealed herself as Greg's killer. Mark later shuts off the lights before he and Sister Michael hide out, while the evil Sister Regina fires shots wildly. She is later distracted by Mark, who bangs the organ, which allows Sister Michael to knock out the villainess with a right hook. Sister Regina is arrested for Greg's murder, and she turns against her co-conspirators as she's taken away.

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