Accused Ravi Kumar (32) had been declared 'proclaimed offender' by a court in a case of attempt to murder in Gurgaon, Additional Commissioner of Police (Crime) Ravindra Yadav said.
"Ravi, with the assistance of his close aides Sandeep Ghadoli amd Shoukee (both already arrested), used to commit heinous crimes," Yadav said.
He was arrested on April 15 following a tip-off.
Ravi and his four accomplices were arrested earlier in an attempt to murder case of Delhi Cantt. However, after coming out on bail, he got involved in several cases of murder, attempt to murder and kidnapping, said Yadav.
"Once, when he was lodged in Bhondsi Jail, Gurgaon, for possessing illicit firearms, he caused rioting there," said Yadav.
Later, Ravi joined the gang of Sandeep Ghadoli and became its key sharp shooter, he added.