An 11-year-old Nevada boy being driven to school by his stepdad was shot dead by a gun-toting maniac during a horrifying road-rage attack on a jam-packed freeway Friday morning, authorities said. Tyler Matthew Johns, 22, was busted after he allegedly fired one fatal shot that struck the young boy seated in the back seat of the small hybrid SUV during the heated clash around 7:30 a.m. on Interstate 215 in Henderson, 16 miles south of Las Vegas, according to the Henderson Police Department. “We