Thomas J. Summerwill of Campton Hills is charged with two counts of second-degree murder in the March 24 death of his mother ,53-year-old Mary Summerwill.
A coroner determined Mary Summerwill died of cranial injuries.
Prosecutors said Tuesday that Summerwill’s belief that his mother was an intruder ‘was not reasonable because of his alcohol impairment.’
Dixon said Summerwill had recently returned from a trip to Europe and may have had jet lag.
Second-degree murder is punishable by probation or up to 20 years in prison.
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