According to his younger brother Steven Dugan, Brian attempted to molest him in 1972 after a stay in a youth home; Steven suspected Brian may have been sexually assaulted there. In 1974, Dugan attempted to abduct a 10-year-old girl from a train station in Lisle. Charges were brought against him but later dropped. In 1975, he threatened to kill his older sister, Hilary, and to "chop up" her son, and he vandalized her car. His brother Steven said that Dugan complained of being sexually abused while serving time in the Menard Correctional Center from 1979 until 1982.