New Delhi, June 16 -- A key associate of notorious serial killer Devender Sharma alias 'Dr Death' has been arrested by Delhi Police from Aligarh in Uttar Pradesh after remaining on the run for 21 years.

The accused, identified as Rajender alias Rajua (59), is a resident of Kasimpur in Aligarh and a proclaimed offender, according to police.

The official said that Rajender was apprehended on June 14 by a team of Crime Branch. "He was wanted in a 2004 case of murder, kidnapping, causing disappearance of evidence, criminal conspiracy and common intention at Sarita Vihar Police Station," the police officer said.

"A court had declared Rajender a proclaimed offender in the case, but he had managed to evade arrest for over two decades," the offi...