Nebraska police chief wanted for questioning for a murder; Arizona couple bilks people by posing as doctors; Oklahoma family reunites.

Woman is run over by her own car; Missouri arsonist; New York City coin scam; mystery illness strikes an Oakland family.

A satanic cult may be linked to the "Son of Sam" murders; swindler found dead; unclaimed $200,000 in Nebraska.

Jerry Strickland and Missy Mundy are wanted for kidnapping and murder; a final appeal for Michael Martin, convicted in a gas station robbery; the unexplained death of Kurt McFall; an update on the heirs of Charlie Scheel.

Mysterious lights in a Texas town; woman robber sought in Georgia; two teenagers murdered in Washington.

Here today, gone tomorrow. Thousands of people go missing in the United States each year, leaving behind only a mystery without any clues. Their stories are told in "Disappeared" through the voices of family, friends and investigators trying to solve the case, with each hourlong episode recounting the final stages that led to a person's disappearance. Interviews with experts including psychologists and forensic specialists provide new insights into what may have happened -- whether foul play was involved or the subject simply ran away.

"Unsolved" is a new limited series that draws from the experiences of Greg Kading and Russell Poole, two former LAPD detectives who led separate investigations into the murders of iconic rappers Tupac Shakur and The Notorious B.I.G. Based on Kading's book "Murder Rap: The Untold Story of the Biggie Smalls & Tupac Shakur Murder Investigations," the series juxtaposes the two investigations alongside flashbacks into the relationship between Tupac and Biggie.

Travel Channel's fascination with mysteries grows with this series, adding it to a catalog that also features "Mysteries at the Castle," "Mysteries at the Museum" and "Monumental Mysteries." America's vast network of national parks -- dense expanses of virtually unexplored wilderness -- offers breeding grounds for the unsolved and unexplained. Each hourlong episode presents several perplexing stories detailing unusual events at sites including Montana's Glacier National Park, Pennsylvania's Gettysburg National Military Park, California's Shasta National Forest, and Puerto Rico's El Yunque National Forest.

Anchored by Lester Holt, "Dateline" is NBC's signature newsmagazine, bringing viewers storytelling at its best by putting the pieces together to present the full picture of real-life events. NBC News correspondents cover compelling stories and issues of the day, ranging from mystery and crime to in-depth investigations and breaking-news events.

"Dateline" has been a staple of the newsmagazine genre since premiering in 1992. Given how long it's been on the air, the show has an extensive archive of in-depth news stories and investigative journalism. This syndicated version offers viewers another chance to watch some of the show's previous content, serving up real-life mysteries and in-depth investigations from the show's 20-plus years on the air. Cases involving murders and missing people are frequent topics on the series that has won multiple Emmys in the news and documentary category.

Mystery writer and amateur detective Jessica Fletcher - a down-to-earth, middle-aged widow - ferrets out the criminals in idyllic Cabot Cove, Maine, which apparently is the murder capital of the United States for the show's 12-season run. Though while traveling, she uncovers a fair number of killers as well.