The incident took place in Jawali village at Loni.
According to police, the youth Sushil used to tease the girl, a student of class 11, every day.
"Today, when the girl was returning home from school, Sushil accosted her in a nearby street and started teasing her. He followed her to her house.
When the girl's father Satish saw that the boy was eve- teasing her daughter, he got furious and rebuked him, following which Sushil took out a pistol from his pocket and shot at him," a senior police officer said.
Meanwhile, locals overpowered Sushil and thrashed him, resulting in his death, police said.