Parmeet Dabas (28), who has represented India in rugby in Pakistan, Sri Lanka and Uzbekistan, was arrested on August 2 from near the main gate of Sanjay Van in south Delhi, police said.
A 9 mm pistol containing two live cartridges in its magazine was recovered from his possession, a senior officer said.
On April 30, gangster Monu Daryapur, his personal security officers -- assistant sub-inspector Vijay Kumar and constable Kuldeep -- and two others, Arun Shastri and Yogesh, were attacked by armed assailants at outer Delhi's Mianwali Nagar.
Sonu Daryapur, a distant relative of Dabas, had planned the killing Monu, the DCP said. Sonu allegedly wanted to kill Monu because he had married his sister against his wishes, the officer said.
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In April 2016, Dabas was hospitalised for pancreatic surgery and had to take a huge loan for the treatment, that he was unable to repay, the DCP said.
Dabad had discussed his financial crisis with Sonu, whom he referred to as 'Mama'. Sonu offered to help Dabas on the condition that he would have to help him eliminate Monu.
They kept tracking Monu for three-four days before killing him. On April 30, Dabas located Monu at Shoukeen Chowk, Peeragarhi, Delhi and informed the other gang members who then attacked Monu.
The officer said so far, the police have arrested six men in connection with the triple killings. The police had announced a reward of Rs one lakh each on the head of all accused, including Dabas.
Dabas has earlier been jailed in a murder case, the office said without elaborating.
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