Earlier this month, Western Pennsylvania was rocked by another domestic violence related murder-suicide — and this time, the estranged husband shot two police officers, one fatally, before killing himself. It is an all-too-familiar news story in Pennsylvania and across the United States: a husband or boyfriend kills his current or former wife or girlfriend and potentially others (family members, children, first responders) before killing himself. In many of these cases, the

This originally was published in the Harrisburg Patriot-News on September 9, 2015. ----------------------------------------------------------------------------------------------------------------------------------------------------------------- It was a tragedy that shocks the conscience and rattles a community's sense of security and serenity. Shortly before noon on Labor Day, just outside a popular Mount Gretna ice cream parlor, Patrick Derr, 47, of Richland, fatally shot h