Marceline Herdlick On January 9, 1955, Duncan was walking through
California Street when he spotted a second-floor apartment. After climbing up the fire escape, he peeked through the window, where he saw 82-year-old tailor Marceline Herdlick counting some money. Duncan then entered through the window, intending to attack her. Fearing that he might get caught, Duncan hit her in the face, causing the woman to fall to the ground. He then choked her to death before proceeding to
copulate with her corpse. After assuring that Herdlick was dead, he then searched through the drawers in an attempt to find any money or valuables, before leaving. On his way, he accidentally dropped a small desk radio, which was left lying on the fire escape. As in his previous murder, he started viciously beating the frail woman, who quickly succumbed to her injuries. After rifling through the apartment in search of something to steal, Duncan then exited through the window, pulling the shades to obscure the body from view, partially tearing them off in the process. The following day, Rev. William Hughes, a
Roman Catholic pastor at the local Sacred Heart Catholic Church, became concerned for Manning, as she attended morning Mass regularly. He then contacted her neighbors, the Sansings, who also suspected that something had happened, noting that her mail box was full, something they considered unusual since Manning was expecting a letter from a niece from
Quantico, Virginia, with whom she had plans to move in.
Ada Romig On April 5, 1957, Duncan was in the Grove Street area when he came across 68-year-old Ada Romig, an elderly pensioner who lived nearby. He attacked her in a vacant lot, repeatedly beating her and smashing a brick in her face, before dragging her to nearby Fulton Street. After hurling her body over a brick wall, Duncan continued dragging Romig until he found another vacant lot, where he left her. The semi-conscious woman was left lying in serious condition until a passer-by spotted her and alerted the authorities. She was only able to provide a partial description of her attacker, saying that he was "about 40" and had dark hair. ==Arrest and confessions==