HACKENSACK - A man arrested as part of a large drug crackdown is under investigation for possible connections to cold murder cases.

Police in Hackensack say they made more than 1,200 narcotics arrests over the past year in an operation being called the largest drug crackdown in the city's history. Multiple law enforcement agencies joined forces to make more than 160 arrests this week alone.

One man arrested as part of the sweep was already on lifetime parole for the 1969 rape and murder of two teenage boys in Virginia and the sexual assault of children in New Jersey. Now Charles Williams, 62, could be connected to a handful of state cold cases.

"We uncovered he was involved in a stabbing in our city," says Police Director Michael Mordaga. "We solved that case." Williams is now under investigation for cold murder cases in New Jersey and other states. 

Williams has lived in Bergen County for about 25 years and most recently, in a Hackensack apartment building.

"There's kids all over and to have something like that right next to you like that and don't know it ... it's crazy," says neighbor Harrison Larkins.

Williams worked for a furniture company for almost 20 years. He is being held on $750,000 bail.