The 2007 disappearance of Irina Malezhik led to the arrest of Dmitriy Yakovlev, who was suspected of the 2005 murder of Viktor Alekseyev and the 2003 disappearance of Michael Klein. 

Fresh eyes would help the N.Y.P.D. and state police investigators find a man suspected of the 2000 and 2005 murders of Dora Almontaser and Angel Serbay, respectively. 

Investigators wondered if the motive behind Jonathan Levin's homicide was connected to the victim's incredibly wealthy father, until a message left on an answering machine led them closer to the truth.

N.Y.P.D. detectives investigated whether the death of Borys Kiejliches could be related to a murdered Russian man found along the Staten Island shoreline, both of whom were found on the same day. 

Police were called to an East Harlem apartment where Carmen Quinones and Ruben Frederick were found stabbed to death. The woman's 3-year-old granddaughter was also found at the scene. 

A sneaker print and an intricate knot led detectives to believe that the purported suicide of Adrienne Shelly wasn't a suicide at all. 

A peculiar lack of blood at the crime scene puzzled detectives trying to uncover who tortured and killed one of their own. 

When someone shot four people at a N.Y.C. nightclub, leaving one dead, officers from other precincts recognized similarities to the separate murders of three Brooklyn men. 

N.Y.P.D. detectives had to find who shot rising actress Jennifer Stahl and her friends in what appeared to be a robbery gone wrong

N.Y.P.D. investigators had to devise a plot to have two suspects arrive at separate parole appointments concurrently to find who brutally murdered Jason Adams.