The lifer, Jiten Nath, attacked his wife with a sharp knife following an altercation with her and escaped from the house Saturday, police said.
The family members launched a search for him and found him hanging from a tree in the backyard of his house Sunday.
His wife was shifted to Guwahati Medical College Hospital in a critical condition.
Nath was on parole for 20 days and was scheduled to return to Tezpur Central Jail Tuesday.
He was sentenced to life imprisonment for killing his friend Bidul Das.
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