NORRISTOWN, Pa. (AP) -- A former state trooper is going to prison for six to 23 months for a drunken driving crash near Philadelphia that killed a young man in a disabled car. The sentence Tuesday comes after 42-year-old Barry Searfoss Jr. of Coatesville pleaded guilty to involuntary manslaughter and driving under the influence in the 2012 crash. Authorities say Searfoss was off-duty following a charity golf outing, with a blood alcohol level of .188, when he struck a slow-moving car in Upper Dublin. A fiery crash ensued, killing 21-year-old Robin Williams of Philadelphia. The Philadelphia Inquirer reports that the plea agreement in Montgomery County avoided a legal fight over whether Williams' car problems contributed to the crash. A defense lawyer says Searfoss understands that a life was lost.