Kalyan, undergoing life sentence in the central jail here, hanged himself from a 45-feet-long tree yesterday inside the jail premises, they said.
Later, his body was brought down from the tree with the help of fire brigade, the police said.
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Taking note of the incident, prison guard Rajiv Kumar Tiwari has been suspended and a probe has been ordered into the entire incident by the Deputy Inspector General (DIG), they said.
Kalyan had killed his sister-in-law and niece in his Harinagla village in Badaun in 2005 and was later arrested.
He was awarded life imprisonment by a Badaun court and was shifted to the central jail here in 2012.