DID A MEETING SET UP ON A DATING APP LEAD TO THE DISAPPEARANCE OF KELLY DWYER, OR WAS IT SOMEONE SHE KNEW?

"48 Hours" Investigates in "The Disappearance of Kelly Dwyer"

Saturday, Nov. 2

Kelly Dwyer vanished after a night out in Milwaukee in October 2013. Did a meeting set up on a dating app lead to the disappearance, or was it someone she knew?

Correspondent Peter Van Sant and 48 HOURS investigate Dwyer's story and the quest for answers in "The Disappearance of Kelly Dwyer" to be broadcast Saturday, Nov. 2 (10:00 PM, ET/PT) on the CBS Television Network.

It's a case about a young woman with a promising future cut short. The investigation raises questions about the risks of online dating, risky sex and the hidden double lives unknown by those who loved them.

"There are some evil people out there," says Katherine Spano, who was a detective with the Milwaukee Police Department when Dwyer went missing.

The investigation began when Dwyer didn't show up for work on Oct. 12, 2013. Her co-workers were the first to respond by calling her cell phone and checking social media. Investigators would learn her phone was dead, her social media was down and her debit card hadn't been used.

"In an age of an electronic footprint, if you will, it's not there," says Assistant District Attorney Sara Hill. "It's like she just isn't anymore."

Investigators would learn that Dwyer had been last seen alive on a date with Kris Zocco, whom she had been dating for about a year. Police initially think Zocco had something to do with Dwyer's disappearance - which he denies. But then, Zocco was arrested for drugs that police found while searching for clues to Dwyer's disappearance. Investigators also learn Zocco had a long-time girlfriend who didn't know about Dwyer. Investigators also learned Dwyer was dating others she had met through dating websites. Friends also told police they occasionally noticed bruising on Dwyer's wrists and neck, something they say she laughed off as a crazy night.

Everything changed 18 months later when Dwyer's body was found in a rural area 38 miles from Milwaukee.

Where does the twisted tale lead? Van Sant and 48 HOURS report the story of Dwyer's disappearance through interviews with her friends, investigators and Zocco's mother and Zocco's attorneys. 48 HOURS is also there for the dramatic courtroom showdown.

48 HOURS: "The Disappearance of Kelly Dwyer" is produced by Susan Mallie and Josh Gelman. Ryan N. Smith is the development producer. Lauren A. White is the field producer. Kevin Dean, Jud Johnston, Diana Modica and Greg Kaplan are the editors. Anthony Batson is the senior broadcast producer. Nancy Kramer is the executive story editor. Judy Tygard is the executive producer.

Follow 48 HOURS on Twitter, Facebook and Instagram. Listen to podcasts at CBSAudio.