Colleen O'Brien

Colleen O'Brien was an American woman who lived in New York City in Earth-199999. She was the roommate of Peggy Carter for a few months in early 1946. O'Brien would often tease Carter for being single despite her good looks. Carter was secretly an agent for the Strategic Scientific Reserve, and this dangerous occupation proved to be O'Brien's undoing, as an enemy of Carter's invaded their apartment and shot O'Brien in the head while she slept in April 1946.