Devendra Singh, in his fifties, was on emergency duty from 8 pm and had got a service revolver issued for work around 6 pm, the police said.
He went to an isolated place on the banks of Yamuna near Kalindi Kunj bridge in southeast Delhi between 6.30 and 8 pm and shot himself dead, a police official said.
His motorcycle was found parked at the spot where his body was found, the official said, adding no suicide note was recovered.
The official, who did not wish to be named, said it is suspected that there was tension in his family life.
Disclaimer: No Business Standard Journalist was involved in creation of this content