"He also used to go for walk in the morning in a park outside his cell," he said.
This is the first time that Tihar Jail witnessed a hanging in the last two decades. The last was Kehar Singh and Satwant Singh, assassins of then Prime Minister Indira Gandhi who were sent to gallows in 1989.
The jail authorities refused to share any details about whether he had any last wish or about any final words.
Guru was found guilty of conspiring and sheltering the militants who attacked Parliament on December 13, 2001, in which nine persons were killed.
