A grandfather in Erie, Pennsylvania, kills eight people, including a pregnant woman and two young children, before turning the gun on himself in an unthinkable domestic massacre. In Chicago, transit workers and prosecutors demand urgent electronic monitoring reform after a repeat offender on curfew violations fatally stabs a veteran CTA janitor during a daytime fare dispute. And in Delaware, two teenagers face criminal charges after terrorizing suburban homeowners with tactical gear and replica rifles in what police call a dangerous late-night prank. Sydney Silvagni reports.