Gemma Hoskins is a retired teacher from the Baltimore area who dedicated her retirement to solving two area cold cases: the murders of Cathy Cesnik and Joyce Malecki. Hoskins was a senior at Keough Archbishop High School at the time of Cesnik’s disappearance. The amateur investigation she helped run was featured on the 2017 Netflix documentary The Keepers, which explored ties between Sister Cesnik's murder and alleged sexual abuse by Father Joseph Maskell, the high school's Chaplain at the time.