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'Bathtub Killer' murdered two women in the same apartment complex. How did authorities bring him to justice?

The murders were both shocking and horrifying.

On September 17, 1996, the strangled body of 26-year-old elementary school teacher Christine Vu was found bound with duct tape in a half-filled bathtub in her Arlington, Texas, apartment, according to WFAA.

Almost three months later, the same murderer struck again – very close by.

Wendie Prescott, Vu's neighbor, was found bound with duct tape and strangled in her bathtub on December 24, 1996, according to WFAA.

Like Vu, the 22-year-old teaching assistant had also been sexually abused.

“The crime scenes were absolutely horrific – brutal and violent, the worst nightmare for anyone confronted with such an attack,” Arlington homicide detective Tommy LeNoir told NBC5 in 2009. “I don't even want to think about what the ladies went through.”

Her brutal death is the subject of this week’s brand new, two-hour episode of Date line. The episode, titled “Dark Intentions,” airs Friday, June 7 at 9/8c on NBC. (An exclusive clip can be seen below.)

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Although investigators took a fingerprint from a television stand in Prescott's apartment, they were unable to identify the killer for four years.

In 1999, Dale Devon Scheanette was finally linked to the murders. He had broken into a car radio store in DeSoto, Texas, and it was his arrest for the crime that brought the case to light.

“We got a search warrant, blood samples and a DNA hit on two murders,” LeNoir said, according to NBC5. “From there, we started getting hits on other cases, the sexual assaults. It just took off.”

Scheanette, nicknamed the “Bathtub Killer,” was later blamed for four more sexual assaults between September 1998 and October 1999.

In January 2003, he was found guilty of capital murder in connection with Prescott's death. According to FOX News, he was charged with Vu's murder but never went to trial.

At his execution in February 2009, 35-year-old Scheanette was asked if he had any final words.

He replied: “All I'm saying is that no case has ever been tried without mistakes. Those are my words. No case is without mistakes,” according to FOX News.

Date lineThe all-new two-hour episode, “Dark Intentions,” airs Friday, June 7, at 9/8c on NBC. Andrea Canning reports.