At Death's Door

S2, E13: Rochester Investigators David Salvatore and Tom Donovan arrive at the scene of what appears to be a straightforward domestic homicide only to discover that no one who saw the suspect knows his real name or whereabouts. Instantly, the case becomes a race against time to identify the suspect before he disappears. After employing a myriad of methods, from examining the Police Department's citywide network of digital cameras, to tracking cell phones, to good old fashioned detective work of talking to witnesses all over town, investigators are finally able to identify a solid lead. But will it lead them to the killer or another dead end?