South Dakota police solve 38-year-old homicide of infant

FOX NEWS - Police in South Dakota have finally solved the 38-year-old cold case of an abandoned baby using DNA from genealogy sites to identify the child's mother.

Theresa (Josten) Bentaas, 57, was arrested Friday in the 1981 homicide of her baby boy.

The Sioux Falls police discovered a full-term baby dead, wrapped in a blanket and abandoned cornfield ditch on Feb. 28, 1981. The cause of death was judged to be exposure to the elements.

For decades, no suspect was ever identified but recently Detective Mike Webb, who was assigned to look at the case in 2009, submitted the child's DNA to NanoLabs, which found two possible matches using the public genealogical database GEDmatch.