A Wisconsin jury found a man guilty of murdering a Wausau woman during one of a series of arsons for which he already is serving a 38-year prison sentence.
Kevin Zarm, 41, faces a mandatory life term after being convicted of first-degree intentional homicide, burglary and theft.
Sylvia Grade, 84, was killed outside the detached garage of her home in the early morning hours of Sept. 11, 2003.
Prosecutors said Zarm killed Grade after she caught him stealing from the garage.
An autopsy showed she died of blunt force trauma to the head.
Last May, Zarm was convicted on 26 counts of arson, burglary, theft and reckless endangerment involving more than 20 arson fires in the area during a four-month span in 2003.
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