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Mark Harrison is the pedophilic abusive stepfather of Adam Jackson. He appeared in the Season Four episode of Criminal Minds, "Conflicted".


Little is known about Harrison, other than he married Jackson's mother Rosemary. After she died, Harrison began to abuse Jackson by beating him, forcing him to cross-dress, and is even implied to have abused him sexually. Eventually Jackson was removed from Harrison's custody and placed in a foster home.


Harrison and Jackson meet again when he was staying at the Corpus Christi. He holds Harrison at knifepoint and tied up with a plastic bag over his face.