Heim will never forget the first time he really laid eyes on Michael Corbett. With Dunn's statement, along with the statements from Kimmy and Rick, Corbett's neighbors at the apartment, together with other evidence, Heim and Smit had enough to bring Corbett in for questioning.

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They brought him into the office of the El Paso County sheriff, Heim recalled. "I think Lou Smit was with me, and maybe another detective, and I ordered [Corbett's] arrest."

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"He looked at me and he said, 'Hey, DA, I'm gonna get your ass.'"

It was, Heim later told Crime Library, a chilling glimpse into the bottom of Corbett's soul. "That's the kind of guy he was, just a bloody sociopath."

Smit too, recalls Corbett's icy glare. "I remember looking at him in court," Smit said. He and I got into a staring contest and he was cold. His eyes were really cold."

In the end, it fell to Russel, the Fourth Judicial District DA, to put together the prosecution's case against Corbett and Glenn, though another prosecutor actually handled the trial work. Russel, who later pursued Bundy, never had any doubts about the case he built against both men. The evidence, including Dunn's statement, was a powerful and terrifying glimpse into the souls of men who had no conscience.

What has always troubled Russel is the question of why they did what they did. But that question had haunted him on other cases as well.

"We never got a good satisfactory answer to that," Russel said in a recent interview. "It was just a spree -- they felt like letting it all hang out. I prosecuted Bundy too and I never got a satisfactory answer on that one either. Sure, these guys fit the same profile as Bundy, but they weren't as smart as Bundy."

In 1976, a year after Lou Smit traced Karen Grammer's blood trail back to that vacant apartment and cracked the case of one of Colorado Springs' worst murder sprees, Glenn and Corbett were convicted of murder in separate trials. Glenn was convicted of three counts of murder, including Grammer's slaying, and Corbett was judged guilty in the deaths of Profitt, Watson and Van Lone.

Both were sentenced to die.

Authorities at the time, and to this day, say they believe they could have prosecuted both men for additional murders, but decided against it, figuring, as Heim would later put it, "you can only execute somebody once."