Detectives, officers, and other members of the New York Police Department reveal just how ugly the city can be, sharing their recollections of some of their grisliest cases.

It may be known for sun, surf, sand, and star power, but Los Angeles County is also home to more than 9 million people — which means that the Los Angeles County Sheriff's Department is tasked with investigating a vast number of harrowing cases. Among these crimes are "the most brutal and complicated murders."