Sean "Mac" McEvoy (b. 21 May 1960; d. 2 Feb 1995) was the son of Millie and Tom McEvoy, the twin brother of Jack McEvoy and younger brother of Sarah McEvoy, and the husband of Riley McEvoy. He enlisted in the Army in the early 1980s, after which he joined the Denver Police Department in 1983. He had grown up in Boulder, CO, and came back there to live after the army. By the mid-1990s, he had worked his way up to the position of homicide detective. He was the supervisor of the Crimes Against Persons (CAPs) unit.