Dilbag Singh, 32, committed suicide by jumping in front of a train near Garhi Harsaru railway station here.
"He left a suicide note in which he alleged that his wife Kavita used to torture him mentally and often beat him. She threatened the victim and his family of dire consequences," a police officer told IANS yesterday.
Kavita, a Delhi Police constable, is posted in Fatehpuri Beri area of south Delhi.
The driver of the train told police that the way the victim jumped showed clearly that it was suicide, not an accident.
"On the complaint of the deceased's father Jai Singh, we have booked Kavita under section 306 of IPC," police said.
The deceased lived in Basai Enclave area with Kavita and their nine-year-old son. He was working with an auto company as an engineer.