GREAT FALLS, Mont. (AP) — The Cascade County Sheriff's Office in Montana says evidence preserved on a microscope slide after a 1956 double homicide helped them close the books on the 65-year-old case.

Investigators concluded Kenneth Gould, who died in Missouri in 2007, more than likely killed 16-year-old Patricia Kalitzke and Duane Bogle northwest of Great Falls. Both were shot in the head.

In 2001, a cold-case detective sent the DNA evidence collected from Kalitzke to the state crime lab. Lab workers found a sperm cell that did not belong to Bogle. By comparing the DNA evidence on the slide to commercial DNA databases, investigators were able to connect Gould to the case. 

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