Ted MacIntyre is the pedophilic uncle of senile victim Bess Sherman. When she was little, MacIntyre would often rape her, which is why she would sneak in at night through the apartment window of her best friend, Isabel Stayton. Isabel would comfort her as she cried and let her spend the night on more than one occasion to keep her safe.
When Bess was brutally tortured with a cigarette by nurse Hal Shipley in her elder years and she ran back to the apartment, which had new occupants she didn't know and simply went inside due to her dementia, Isabel's sister Millie revealed Bess' name and the sexual trauma she suffered.
A brief records search revealed MacIntyre raped five other victims and was imprisoned in 1953, being killed in prison a few years later in 1957. (SVU: "Vulnerable")