Before they're caught, serial killers often fly under-the-radar. But just because police and the public aren't aware of a killing spree, doesn't mean it isn't happening. We look at five unsolved serial killer cases, the murders connected to them and some of the information we do (and don't) know.

Lee Boyd Malvo, part of the D.C. Sniper duo who terrorized the D.C. area in a series of murders, is serving life in prison without parole. But Malvo, who was 17 at the time of the killing spree, may be up for parole in 2022 due to a new Virginia state law.

After escaping a Colorado jail in December 1977, serial killer Ted Bundy fled to Tallahassee, Florida, and went on a rampage, attacking and killing sleeping coeds at the Chi Omega sorority house at Florida State University. One of the survivors of that attack, Kathy Kleiner, spoke with us about getting over her mistrust of men and how authorities can help victims.

Derrick Jamison, who spent 20 years in prison for murder before being exonerated on his execution day, and Robert Dunham, executive director of the Death Penalty Information Center, tell us what it's like in the final hours leading up to an execution.

Ethan Brown, a reporter who spent years investigating the murders of eight sex workers in Jennings, Louisiana and wrote the book 'Murder in the Bayou,' says there's credible evidence to suggest that several offenders have blood on their hands, and that Jefferson Davis Parish's own law enforcement may be implicated in the crimes.

The true crime audience skews largely female, sparking some to question why the genre is so popular among some women. But in Rachel Monroe's book 'Savage Appetites,' she reverses that gaze, turning the lens toward four women who she thinks embody or challenge four classic archetypes of the genre: Detective, Victim, Defender and Killer.

On August 20, 1989, brothers Erik and Lyle Menendez killed their wealthy parents, Jose and Kitty, with a shotgun in their Beverly Hills home. Upon the 30 year anniversary of the murders, we take a look back on the most memorable moments from the intriguing double-murder trial.

Julie Williams, Lollie Winans, Paul Fugate and others are among those who have been killed in national parks and whose cases have yet to be solved.

True-crime writer Billy Jensen empowers readers to become citizen detectives, using social-media resources to identify uncaught criminals. He explains how he does this without interfering in police investigations and tells us about his book, 'Chase Darkness With Me.'

At 89-years-old, David Carpenter—the 1980s serial killer known as the 'Trailside Killer'—is the oldest death row inmate in California. We explore Carpenter's early life, crimes and trial.