A serial rapist who raped, burglarized, kidnapped and assaulted a Kirkland woman in 2008 was sentenced to 40 years in prison in Snohomish County Superior Court on Wednesday.

Marc Patrick O’Leary, who is also serving a life sentence for nearly 40 similar charges in Colorado, was also sentenced Wednesday to 28 1/2 years for raping a Lynnwood teen in 2008.

Lynnwood police initially didn’t believe the Lynnwood woman had been raped and charged her with making false statements. However, the investigation found that O’Leary did rape her and the former Mountlake Terrace man pleaded guilty to those charges on Wednesday before he was sentenced.

In the Kirkland rape, O’Leary, 34, attacked the woman, who was then 63, at her apartment on Northeast 122nd Street in Kirkland on Oct. 6, 2008.

At about 4 a.m., the woman awoke to a man standing over her with a knife. He proceeded to tie her hands with her shoelaces, attack her and take photographs, police reported.

The woman later called police, but they weren’t able to find the assailant, reporting the case “went cold” in 2009.

A new lead developed in April 2011, when Colorado investigators contacted Kirkland police about the attack here.

Colorado police obtained DNA samples and with that evidence were able to search a home where O’Leary and relatives lived. The search found more evidence, including photos of victims he raped in Golden and Westminster.

But Colorado police also found photos of the Lynnwood woman, who Lynnwood police confirmed had reported being sexually assaulted in 2008. When Colorado police found the attack really did take place, the charges of making a false statement against the Lynnwood woman were dismissed and the case was removed from records.

Investigators found the name of the Kirkland victim in O’Leary’s computer, and were able to use the DNA tests from the shoelaces to match them to O’Leary’s Colorado DNA profile, leading to the charges in the Kirkland assault.

O’Leary will serve his prison time in Colorado.