A San Antonio man has been sentenced to 75 years in prison over the 2004 killing of his girlfriend's four-year-old son.
Twenty-two-year-old Paul Castellano was arrested one day after Joshua Pacheco died of what doctors say was strangulation and trauma to the abdomen.
The man had denied killing the boy -- saying the youngster choked on some food.
The Bexar County jury convicted Castellano of murder.
Investigators say the boy suffered the fatal injuries while his mother was at work.
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