Ashwini Kumar, 30, was the main suspect in three murders and reportedly a drug addict, who used to upload TikTok videos of himself posing as a 'villain'.
He also posted violent Facebook messages like 'I will destroy everything', 'Devil is ready now' and 'See my havoc'.
Though he had no criminal record, Ashwini made it to the 'most wanted list' in Bijnore with reward of Rs 1 lakh on his head, after he shot dead a local BJP leader's 25-year-old son and his nephew, following a dispute on September 27.
He also shot dead a girl, who had spurned his advances.
Fifteen police teams had been chasing Ashwini since the past week, when on Friday his location was traced to Bijnore's Nagina area.
Bijnore Superintendent of Police (Rural) Vishwajeet Srivastava said, "He was trying to flee and had boarded a roadways bus to Delhi. A local police team stopped the bus around 1.15 a.m. on Saturday."
Ashwini was spotted after two constables became suspicious of passenger, who had covered his face with a white handkerchief. When the policemen approached a man, he panicked, drew his gun and shot himself in the head. He died on the spot.
The police recovered a pistol, two magazines and a 14-page note with detailed account of the three murders allegedly committed by Ashwini from him.
Ashwini was a graduate and his father was a clerk in a sugarcane cooperative society in Dhampur tehsil, while his elder brother works in a private company in Dehradun.
According to his family, Ashwini also used to work with a private firm in Delhi but abruptly gave it up. His family believes his sustained drug addiction might have affected his mental health.
( With inputs from IANS )