McElroy in 2004
Portrayed by John Benjamin Martin
Episode The Sleepover
Status Alive

McElroy was Philadelphia detective assigned to the murder of Caitlin Gather after her body was found in a park swimming hole in 2004. Noticing the marks left on her body by a marker, McElroy recalled the unsolved 1990 case of Rita Baxter, killed at the same swimming hole on the same day with the same marks on her body.

McElroy called Lieutenant John Stillman and Detectives Lilly Rush and Scotty Valens to the scene to let them know what he'd found. This led to the arrest of Caitlin's killer Neil Beaudry and Rita's killer Ariel Shuman.

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