It's been nearly a decade since four bodies were discovered spread over a quarter of a mile stretch of beach in Long Island, New York. Since then, other remains have been found, with 10 victims or more now likely tied to a single perpetrator.

In three decades as an undercover operative for the Bureau of Alcohol, Tobacco, Firearms and Explosives, Vincent A. Cefalu risked his life investigating groups from outlaw motorcycle gangs to the Ku Klux Klan. Cefalu spoke with us about the undercover moments that frightened him most.

Known for her empathetic approach with the public, officer Jill Marshall was first drawn to law enforcement in high school, and has never second guessed that path. She spoke with us about how she got started, lessons she's learned on the job with the Warwick Police Department and the real story behind her dog's name.

The Richland County Sheriff's Department senior deputy and law-enforcement vet spoke with A&E True Crime about his unit's relationship with the public and how technology makes his job both safer and more fun.

To mark Live PD's 200th episode, A&E True Crime asked you, the Live PD Nation, what you're just dying to know about host Dan Abrams and analysts Tom Morris Jr. and Sgt. Sean 'Sticks' Larkin. From ride-alongs, to tattoos, to what it is that makes Live PD so special, we asked all three of them some of your best questions.  

The Slidell (Louisiana) Police Chief talks to A&E True Crime about the impact the show has had on community relations for his department.

Glynn Martin is a retired officer from the Los Angeles Police Department and the author of 'Satan's Summer in the City of Angels' about the local community's response to the 'Night Stalker' serial murders. Martin shares his experience as a young cop in the L.A. area during Richard Ramirez's reign of terror with A&E True Crime.

There's a new epidemic coming to light in Alaska—and in other areas around the U.S.—where hundreds, and possibly thousands, of Native American women are turning up missing or murdered. But legislative, funding and awareness-raising efforts are under way, and the issue is getting some political traction from the #MeToo movement. .

Officers Juan Mercado and John Oliva of the Mission (Texas) Police Department spoke with A&E True Crime about the challenges of being in law enforcement, their most memorable moments on the job and what they like to do for fun. (Hint: It involves Celine Dion.)

Angeline Hartmann of the National Center for Missing and Exploited Children (NCMEC) and Live PD spoke with A&E True Crime about the NCMEC's response to the Jayme Closs news, misconceptions about missing children cases and the single most valuable tool in being able to find missing kids.