Mohd Saleem was found dead on August 16 and his wife, in her 30s, had misled the police claiming that her husband died naturally after he came home drunk, Pahadishareef police station P Laxmikanth Reddy said.
He said Saleem was allegedly hit on his face while he was asleep and was "throttled" to death by Mohd Yousuf with the help from the woman, the inspector said.
The woman and Saleem, a driver, were married for 12 years with three children.
According to the officer, the woman was allegedly having an affair with Yousuf since the last three years.
During the grilling of the woman and Yousuf, they "confessed" to killing Saleem, he said.
The duo were booked under section 302 (murder) and 182 (giving false information to a public servant) of the IPC. Further probe is on.