PICTURED: US Marshal killed while serving a warrant

Investigators are working to piece together the chaotic sequence of events that led to a deputy U.S. marshal being shot to death while serving an arrest warrant in Pennsylvania's capital city, while colleagues are remembering him as the 'cream of the crop.'Christopher David Hill, 45, was killed early Thursday when a gunman opened fire on law enforcement officers serving an arrest warrant inside a Harrisburg home.Police were on the first floor handcuffing the woman they were seeking to arrest...