Police say Williams doused 49-year-old Maria Serrano with gasoline and then set her and her house on fire.
She died Saturday in Lehigh Valley Hospital. Lehigh County Coroner Scott Grim said Serrano died of complications from burns.
Williams had previously been convicted of murder for a 1994 slaying in Philadelphia. He was paroled in August 2008.
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Information from: Reading Eagle, http://www.readingeagle.com/
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