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48 Hours" can exclusively report there has been a huge break in the 1991 murders of four teenage girls in a Texas yogurt shop.

Could new information lead to answers in the brutal murder of four teenage girls in Austin, Texas, more than 30 years ago?

ALL NEW: A teenage girl goes missing. Will evidence on a secluded beach reveal what happened? "48 Hours" correspondent Anne-Marie Green reports, Saturday, Feb. 21 at 10/9c on CBS and streaming on Paramount+.

After Cati Blauvelt, 22, was murdered in Simpsonville, South Carolina, her husband, former U.S. Army recruiter John Blauvelt, fled with his 17-year-old girlfriend Hannah Thompson. U.S. Marshals led the cross-country chase for the armed fugitive.

ENCORE: A soldier goes on the run after his wife is murdered. With him, his 17-year-old girlfriend. What does she know? "48 Hours" correspondent Peter Van Sant reports Saturday, Feb. 21 at 9/8c on CBS and streaming on Paramount+.

A girl is murdered in Wahoo, Nebraska. More than 50 years later, the clues that led to an arrest. "48 Hours" correspondent Natalie Morales reports.

The unsolved murder of Mary Kay Heese, 17, a high school junior from Wahoo, Nebraska, has hung over the community for five decades. Will what is believed to be the state's oldest cold case finally be solved?

A schoolteacher is murdered in her own home. Years later investigators discover she was a bridesmaid at the killer's wedding. "48 Hours" correspondent Natalie Morales reports.

When a young woman nearly dies from poisoning, investigators focus on the two people she trusted the most. "48 Hours" correspondent Anne-Marie Green reports.

Mary Kay Heese, 17, was found stabbed to death in a field in March 1969. Fifty-five years later, a suspect was arrested -- someone who had been on investigators' radar for decades.