A 23-year-old male nurse has been arrested in Pune district for allegedly killing the wife by administering her lethal injections and trying to pass it off as a suicide, police said on Wednesday.

Swapnil Sawant, the accused, wanted to eliminate his wife as he was having an affair with a nurse who was his colleague at a private hospital and planning to marry her, said an official of Paud police station. Sawant had married Priyanka Kshetre, the victim, only five months earlier and the couple lived in a rented house in Kasar Amboli village in Mulshi tehsil.