David Muir

The real Rudy Rios comes forward. This is the guy that Art Whitaker had been impersonating.

But then... Now to our other top story tonight.

But then... Now to our other top story tonight.

He is a very law and order kind of guy and believes in the death penalty. There's a lot of speculation here, and I don't think anybody knows what the governor's going to do.

He is a very law and order kind of guy and believes in the death penalty. There's a lot of speculation here, and I don't think anybody knows what the governor's going to do.

He will spend the rest of his life in prison with no possibility of parole.

He will spend the rest of his life in prison with no possibility of parole.

Tonight, we take you inside two cases, two young women both brutally murdered in their homes, the killers in each case evading police for decades. In one case, a mother just 19 years old, she was engaged to be married.

Tonight, we take you inside two cases, two young women both brutally murdered in their homes, the killers in each case evading police for decades. In one case, a mother just 19 years old, she was engaged to be married.

Another case in Texas, the beloved teacher, her whole future ahead of her.

Another case in Texas, the beloved teacher, her whole future ahead of her.

You remember walking in and what you discovered?

You remember walking in and what you discovered?

She'd been handcuffed.

She'd been handcuffed.

Of course, the question, who would want to kill each of these women? The mystery behind their murders would torment their loved ones for decades.

Of course, the question, who would want to kill each of these women? The mystery behind their murders would torment their loved ones for decades.

And for the detectives who were working these cases, frustrating dead ends. There was also a suspicion, could it have been a member of law enforcement?

And for the detectives who were working these cases, frustrating dead ends. There was also a suspicion, could it have been a member of law enforcement?

Both of these brutal murders were cold cases for decades. What links both of those cases all of these years later is the cutting-edge forensic technology inside this lab. Tonight, you'll see it unfold right here as they unmask the killer in both cases. It's the first week of December 1988. Nineteen-year-old Kathy Swartz is home with her nine-month-old daughter.