The deceased has been identified as Ram Dayal Verma, a native of Shivpuri district in Madhya Pradesh.
The police have recovered a 30-page suicide note from his pocket, police said.
It was around 7.15 am that Verma's body was found hanging from a tree located between Rail Bhawan and the media parking centre near Vijay Chowk, close to Parliament.
An inquest has been initiated into the matter. Efforts are on to contact his relatives, police added.
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