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.
The armed men had fired indiscriminately at their car, killing Monu, Kumar and Shastri and injuring the other two.
The main accused in the case -- Rajesh alias Raje (47) -- was arrested from Madangir in Uttara Kannada district of Karnataka on July 26, said P S Kushwah, Deputy Commissioner of Police (Special Cell).
Rajesh had hatched a plan to kill Ramesh Lohar, a gangster, and Sonu Daryapur wanted to kill Monu, said the DCP, adding that Rajesh and Daryapur had joined hands to eliminate their respective rivals.
Lohar was associated with Krishan Pahalwan, a gangster from Delhi, since both were lodged in the Rohtak Jail, he said, adding that to counter Lohar, who enjoyed the patronage of the Pahalwan gang, Rajesh had joined hands with Daryapur.