An inmate in Delhi's Tihar Jail was stabbed to death on Monday by another prisoner, allegedly to avenge rape, police said on Tuesday. 

On June 29, in jail number 8 of Tihar central jail, 28-year-old Mehtab was stabbed to death by a 22-year-old inmate who is lodged in the prison in a murder case.

"During initial inquiry at Tihar jail no 8, it surfaced that the prisoner stabbed Mehtab multiple times with a self-made knife-like metal piece," Delhi Police said. 

Mehtab was accused in a rape case of the minor sister of the alleged killer. He was booked under Section 376D, 328, 363, 342, 120B IPC and Section 4 of POCSO Act at Ambedkar Nagar police station, Delhi. 

The girl had reportedly committed suicide later.

The accused had been in Tihar for a murder case and was transferred from jail number 8, to ground floor in ward number 4.

"This transfer was allegedly done on the request of the accused as he had a fight with other inmates in the previous ward," police said.

The deceased Mehtab was already lodged in ward 4 on the first floor.

"On June 29, at morning prayer time, when other inmates came out for prayers, accused went upstairs and finding Mehtab, assaulted him with a knife-like object," police said.

He was holding a deep grudge against the deceased and was looking for an opportunity to take revenge, police added. 

A case under Section 302 (murder) of the Indian Penal Code (IPC) was registered at Hari Nagar Police Station. 

(With ANI inputs)