. >> reporter: but hitchinson said with all the inmates' state appeals exhausted, the families of victims waited long enough for justice. >> i have a responsibility as governor, the most serious one that i can imagine, to set these execution dates. >> reporter: all seven inmates have asked the the u.s. supreme court decides whether to reconsider its stance on the death penalty in arkansas. chris poll own, nbc news. >>> now at 6:00, horror on the highway. a woman hit by a car not once, but twice. police say it was intentional. we're getting new eyewitness accounts and learning how people desperately tried to chase down the driver. >>> high drama and new questions after riders were stranded for hours at six flags. >>> and a firefighter shot and killed on duty. now the man who pulled the trigger learns his fate. hear his message to the victim's family as we get new insight into how it started. >>> news4 at 6:00 starts now. >>> and we begin with breaking news at the top of the 6:00, an arrest now after a series of bold attacks in fairfax county. a woman killed as she crossed the street there