The boy's father told police that his son had cleared the IAS exams recently, and secured 264th rank in the examination.
However, when the final results were out after the interview, Manjunath's roll number was on the list, but it appeared against someone else's name.
Manjunath contacted UPSC officials and also wrote to them seeking clarification, but according to his family, there was no response.
A depressed Manjunath eventually took the extreme step.
Superintendent of police, Coorg district, MN Anucheth told HT that the police were investigating the claims of the victim's parents.
"We have to verify facts. Now an unnatural death case has been registered," he said.