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Dateline

Convicted murderer Drew Peterson speaks out about the murder of his third wife and the disappearance of his fourth wife.

Dateline

A woman is found murdered after her close friend hears her screaming on the phone; the mysterious death of her boyfriend's twin brother leads investigators to a suspect.

Dateline

A dancer is murdered in her Virginia home.

Dateline

When a young woman is found dead in a field on the outskirts of Green Bay, Wis., a fitness tracker helps detectives solve the mystery.

Lock Up

Lockup: Colorado: Extended Stay

Even for inmates serving hard time, love can be a strong motivator; in prison, reaching out to others can be a dicey proposition; some inmates just don't know when someone's getting too close until it's too late.

Lockup: Long Island: Extended Stay

Suffolk County, N.Y., is the setting for this entry in MSNBC's long-running "Lockup" franchise, which has taken viewers inside jails in cities throughout America, along with some international locales, throughout its run. The Suffolk County Correctional Facility in Riverhead, N.Y., is the featured prison for this season. Regardless of the show's location, the storylines featured on the docuseries are familiar to regular viewers, with fighting among inmates a regular "Lockup" sighting. Prisoners also discuss life in the facility and the crimes that landed them there. The Suffolk County facility may look familiar to viewers -- it has been used as a filming location for episodes of "Orange Is the New Black."

Lockup: San Quentin: Extended Stay

Boredom reigns supreme for prisoners who spend endless hours, days and months confined to their cells; some have devised creative ways to pass the time; one inmate is creating a wall mural, but not with real art supplies.