The deceased Abid, a resident of Loni, allegedly had a relationship with his neighbour's daughter. He, however was married off to another girl in May this year.
Abid's marriage had upset his former girlfriend, whose father lodged a complaint of rape and assault against him, police said, adding that the victim's father Sabir was taken into custody.
Upset over the episode, Abid committed suicide by hanging himself from a fan in one of his acquaintance's' house in Premanagar colony, police said.
The medical report of the girl had not confirmed rape, SHO Brijmohna Yadav said.
Further probe is on in this matter, Yadav said, adding that the accused woman and her father have been taken into custody.