Task: Question Answering
Input (English): Passage: Patrick is a charming yet troubled man. He meets Tara at her bachelorette party. They have a one night stand, and when she comes back home, he goes into a psychotic rage, imagining that he is in love with her; he even goes as far as tattooing her name, Tara, on his arm.
Patrick has her smartphone, so he starts cancelling the wedding plans, the venue, the florist, etc. Tara is able to reverse all the cancellations. Her friend gets a private investigator who finds out that he has had some similar episodes in the past. He had fallen in love with his baby sitter when he was younger and wanted to set fire to the house.
But he is obsessed, he has hallucinations of Tara loving him. At one point, he finds Tara's sister and befriends her and his way to the wedding party.
Tara's friend arranges for the investigator to attack Patrick at the wedding party, but Patrick manages to recover and crash the honeymoon. He attacks Tara's newlywed husband, confronts Tara at the beach and holds her at knife point. She fights him off and sets him on fire, but he recovers again. She finds Michael, but Patrick is relentless and goes on looking for Tara.
Patrick attacks Michael, but Tara finally is able to choke Patrick to death.
In the final scene, Tara and her husband recover at a hospital, but the doctor lets her know that she is pregnant, when the shock is revealed that she is carrying Patrick's baby. 
Question: Who said that someone fell in love with his babysitter?
Output (English): a private investigator.