Former sheriff Ken Katsaris speaks out for the first time in more than 30 years

As one of the most notorious serial killers in history, Ted Bundy has become part of American folklore.

When he was arrested, he confessed to killing at least 30 women in seven states between 1974 and 1978 – and authorities believe that he killed many others.

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But despite the number of victims, convicting Bundy wasn’t going to be easy. In the days before DNA testing was used in court, investigators had to rely on other evidence to prove their case.

One of the investigators who proved Bundy’s guilt was Leon County sheriff Ken Katsaris, who investigated his infamous murder spree in the Chi Omega sorority house in Tallahassee, Florida.

While investigating the case, Katsaris found some damning physical evidence: bite marks on one of the victims’ bodies that matched Bundy’s teeth. It turned out to be the physical evidence needed to convict the notorious killer.

Katsaris recalls the importance of the evidence on Murder Made Me Famous, a true crime docuseries airing on the Reelz Channel on Saturday night. It is Katsaris’ first TV interview in nearly 30 years.

“When I was at the morgue and reviewed the bodies, I realized we had a bite mark,” Katsaris says. “I proceeded to get with the medical staff and try to preserve those as best we could after taking photographs with a ruler.”

“The bite marks became the centerpiece of that investigation,” he recalls. “Certainly, they were very important.

Decades later, Katsaris recalls the chilling nature of the bite marks. “He used his teeth on two of the young ladies,” he recalls. “It’s as if he was definitely signing his signature.

Murder Made Me Famous combines reenactments, exclusive interviews and never-before-seen photos and video to tell the story of infamous murders. Each episode of the show features PEOPLE Senior Writer Steve Helling. The show airs Saturday night at 9 p.m. ET on the Reelz Channel.

Check out an exclusive preview below!