Rameshsingh Pardeshi, who was posted at the Crime Branch in Dhule, located about 380 kms from here, shot himself in the head with his service revolver in front of his wife at their residence in Dhule city around 12.30 am, Superintendent of Police M Ramkumar said.
Pardeshi had some disagreements with his wife following which the couple had a fight late last night.
During the heated argument, the inspector shot himself in the head and collapsed, he said.
Pardeshi was scheduled to retire from service in May this year and had planned to shift to Nashik where his son stays, he said.
The postmortem was being conducted at the government hospital in Dhule from where the body will be taken to his native place in Nashik for the last rites, the official said.
A case has been registered in connection with the incident, he added.