It's a website that helped Golden police capture a suspected serial rapist, by comparing shoe prints.

The arrest affidavit for Marc O'Leary states police were searching for a pair of black Adidas shoes with white stripes when they searched his home. But police didn't know they needed those shoes until after they used the website crimeshoe.com.

On the website, police uploaded photographs of shoe-prints found at crime scenes and learned the prints were of an Adidas shoe.

"This is very important," said Dr. Kelly Elkins, forensic scientist with Metro State. "This is the basis of pattern matching."

Elkins said this website is incredibly helpful for small police departments like Golden.

Crime scene analysis like that "is an expense that cannot be born by some of the smaller labs," said Elkins.

Crimeshoe.com charges $450 for its services, but a department only pays if a match is made. The company states it has more than 22-thousand types of shoes in its database.

"While crimeshoe.com can tell you what make and what brand, it can (also) tell you individual characteristics as well too, in terms of size and wear," said Elkins.

"As footwear is worn it takes on some individual characteristics," that can be detected through this type of service, said Elkins.

Investigators believe O'Leary could be connected to five sexual assaults --four in the Denver metro area and one in Washington. He is now jailed at the Jefferson County Jail on a $5 million dollar cash bond.