20-year sentence for Minn. father who fatally shook baby for keeping him awake

He'll serve nearly 11 years in prison and the remainder on supervised release.

January 17, 2017 at 11:28PM
Robert J. Kaiser
Robert J. Kaiser (The Minnesota Star Tribune)

A 34-year-old man landed a 20-year sentence for fatally shaking his infant son in the family's central Minnesota home.

Robert J. Kaiser, of Farming Township, was sentenced in Stearns County District Court last week after a jury convicted him of second-degree murder.

With credit for time in jail since his arrest in 2014, Kaiser will serve slightly less than 11 years in prison and then the balance of his sentence on supervised release.

While the boy's mother was away for the day, Kaiser was caring for 2-month-old William John Polries-Kaiser in late August 2014 and became angered that the child was not allowing him to sleep. Kaiser shook the boy, inflicting brain injuries. He died a week later in a St. Paul hospital.

The mother, Ginger Polries, told authorities that a text from Kaiser earlier that day said the boy was keeping him awake.

Kaiser told investigators that William fell and hurt his head.

Along with detecting brain trauma, the autopsy revealed that the baby had broken ribs and other injuries in various stages of healing that were likely indicators of abuse.

Paul Walsh • 612-673-4482

William John Polries-Kaiser
William John Polries-Kaiser (The Minnesota Star Tribune)
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Paul Walsh

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Paul Walsh is a general assignment reporter at the Star Tribune. He wants your news tips, especially in and near Minnesota.

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