BRIGHTON, Colo.  — The man who pleaded guilty to gunning down three people in a suburban Denver Walmart last year will be sentenced Friday, but more than 11 months after the crime, his motive remains a mystery.

A judge is expected to send 48-year-old Scott Ostrem to prison for the rest of life without parole, part of a deal Ostrem made with prosecutors to avoid a potential death sentence for first-degree murder.

Ostrem walked into a Walmart in Thornton the evening of Nov.

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