Mark Marabella

The key to solving the toughest homicides lies somewhere in the final hours of a victim's life. In each one-hour episode, determined investigators must piece together events during this critical window to reconstruct the timeline, unlock the motive, and ultimately close in on the killer.

Like trying to decipher the value of a book without ever opening it, judging a person by his or her outward appearance can be a mistake. Someone may look perfect on the outside, but even the most kind-hearted soul has a dark side looming. "Diabolical" is a docuseries that delves into the minds of murderers, asking a simple question: "Why did they do it?" The acts were committed with extreme premeditation -- many were months or even years in the making. Tension builds in each episode as law enforcement taps into the methods of devious masterminds, aided by insights from forensic psychologists and psychiatrists as well as criminal profilers.

Newly released documents and firsthand accounts of close encounters reveal shocking secrets the U.S. government has been hiding for decades.

Shadow of Doubt delves into competing theories of complex crimes, which find witnesses and suspects pointing the finger at each other. In these exceptional cases, every possible account must be considered before the shocking final truth can be discovered. Shadow of Doubt forces us to examine who we believe and why.

Full of salacious acts, secret trysts and cold-blooded murder, the series peeks behind closed doors to shocking crimes that happened inside hotels.

Crime author and investigator Jax Miller and former police investigator Sarah Cailean tackle a mystery that has stumped authorities for nearly two decades -- the confounding cold case of Lauria Bible and Ashley Freeman, two Oklahoma teenagers who disappeared in December 1999 after the Freeman family trailer was burned to the ground. In the four-part documentary series, the investigators delve into the many strange theories of the case and unravel a much larger story of unsolved murder, allegations of cover-up and corruption, and a truth that proves even more incredible.

Through newly revealed interviews from Attica Correctional Facility, New York's most prolific serial killer, Joel Rifkin, reveals exclusive insights into the mind of a monster.

The complex engineering challenges that make re-entry into the earth's atmosphere so dangerous. Scientists have labored for years to bring a crew safely home in what is essentially a meteorite, wrapped in a cocoon of fire, hurtling towards earth six times faster than the fastest bullet. Scientific experts from NASA explain the significance of Columbia's events as they unfolded, offer insights into what may have caused them and how those key events contributed to the shuttle’s ultimate destruction.

Best-selling author Whitley Strieber revisits the site of his traumatic alien encounter for the first time in several decades.

Yolanda McClary, a renowned forensic specialist and former Las Vegas crime investigator who specializes in the recovery of DNA, has made it her mission to help give Jane Does their names back. Using groundbreaking new forensic technology and DNA databases, Yolanda and her team of genealogists set out to help local law enforcement solve a murder case from 23 years ago and reveal the identity of a woman left for dead in the remote woods of Polk County, Oregon. With nothing but bones, Yolanda works feverishly to piece together what happened and potentially uncover clues that can help open new roads in the case.

A film about Timothy Leary's life and death. Dr. Timothy Francis Leary (October 22, 1920 -- May 31, 1996) was an American writer, psychologist, futurist, and advocate of psychedelic drug research. An icon of 1960s counterculture, Leary is most famous as a proponent of the therapeutic, spiritual and emotional benefits of LSD. He coined and popularized the catch phrase "Turn on, tune in, drop out."

Host Neil deGrasse Tyson tackles one of science's major challenges in each segment of Where Did We Come From? He will guide us as he explores dramatic discoveries and the frontiers of research that connect each central, provocative mystery. Program includes: Revealing the Origins of Life; Origins of the Solar System; Lice and Human Evolution; and Profile: Andre Fenton