The accused, Brijpal was staying with Urmila after his wife's death. Urmila was also a widow but they were not officially married, police said.
After the duo had an argument yesterday, Brijpal hacked her to death and later consumed poison, Circle Officer D K Mittal told reporters here.
Urmila's son has lodged a complaint against Brijpal in this connection, Mittal said adding, the bodies have been sent for post mortem and police is further probing the issue.