ELK RIVER  (AP) - The Sherburne County sheriff's office says the Innocence Project of Minnesota has closed its investigation into a 1992 murder in rural Big Lake.

Kent Jones is serving a life sentence for the murder of Linda Jensen, who was found assaulted and stabbed to death in her home.

The Innocence Project took on the case in January 2011. The project takes on cases of convicted people and works to prove their innocence through DNA testing.

In August, a judge denied a request to retest a knife found at the murder scene.

Jones was convicted once in Sherburne County, but that conviction was reversed, then he was convicted again.

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