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Tom clements dead. this is a fast moving story. casey weyand joins us. what's the latest, casey? >> reporter: the latest is, anderson, authorities are asking for help from the public. because they don't have a good sense of who this shooter might have been. the latest bit of information they are pursuing is they're looking for a woman who they describe as a speed walker, who was walking through this neighborhood, she's described as a woman between the ages of 35 and 50 years old, wearing a cap, a jacket, and pants, light-colored pants, exercising through the neighborhood. they say she is not a...

Also tonight, a major break in the biggest art heist ever. precious works valued at half a billion dollars, stolen. we have an exclusive interview with a former guard from the museum where the art was taken. we'll tell you what the fbi now knows and take you inside the daring crime. we begin, though, with that manhunt. now a massive search for a brazen killer who walked up to the doorstep of colorado's prisons chief, rang the bell and shot tom clements dead. this is a fast moving story. casey wian joins us. what's the latest, casey? >> reporter: the latest is, anderson, authorities are askin...

Has there been a dramatic increase? that's the question, tonight dr. sanjay gupta joins us for that. also tonight, a major break in the biggest art heist ever. precious works valued at half a billion dollars, stolen. we have an exclusive interview with a former guard from the museum where the art was taken. we'll tell you what the fbi now knows and take you inside the daring crime. we begin, though, with that manhunt. a massive search for a brazen killer who walked up to the doorstep of colorado's prison chief, rang the bell and shot tom clements dead. this is a fast moving story. casey wian...

Car that a neighbor saw parked out here on the street. didn't have anyone in it. it was left running at about the time of the first 911 call. then later, a few minutes later it was gone. so they're trying to figure out how that car might tie into it. they're looking for a speed walker that was in the area that may have more clues. but so far, not a whole lot to go on. meantime, they have stepped up security around the governor's mansion here. also around the state capital. and we're also hearing that the prison system is on a modified lockdown. so a lot of people on edge as this investigation ...

Possible new lead. investigators are looking for a speed walker, a woman who was in the area may have seen a car connected to the killing. cnn jim spellman is in mon you umt, colorado, for us. what's the latest you're hearing there? >> reporter: brianna, this brutal murder shocked so many people from here in the neighborhood to the governor's mansion. police scouring for potential leads in the shooting death of tom clements as he answered the door at his home. >> we're sensitive to the fact that because of the position he held, there could be any number of people who may or may not have a moti...