The deceased, identified as Subash, was posted as a constable at Police Line and was staying in E block there, DSP, headquarters, Mukesh said.
The incident was reported by Subash's neighbour who said that a foul smell was coming from his room that had remained closed for the past few days, he said.
The body has been sent for post-mortem, Mukesh said, adding that his family has been informed about the incident.
The matter is being probed, police added.