Patrick Sullivan is a con artist and a pedophilic rapist partnered with Lorraine Dillon and her daughter April Troost. Sullivan molested Troost when she was fourteen, siring a child from the rape and leaving Troost's stepfather to place April in a facility to have the baby. On-staff cook Arliss Driver helped her deliver the baby, but Troost buried them alive when they were born deformed.
Troost never fought Sullivan over being raped and became both a sociopath and accomplice of Dillon, who would lease Sullivan for cons every now and then. Sullivan was brought on for the extortion of David Glass, in a fake "death" by the women giving Glass a gun with a blank in the middle of an "altercation" to fire. Blackmailing him out of 500 thousand dollars, which later led to Glass committing suicide out of duress, Troost killed Sullivan out of revenge and to keep more of the con money, using Glass and even Dillon as patsies.
Eventually, Driver and Dillon turned on her for her baby's murder and got her imprisoned. (L&O: "Flaw")