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DENVER (AP) -- Police investigating the shooting death of Colorado's top prisons official are appealing to the public for help as they checked surveillance video and pursued other leads.

Fifty-eight-year-old Tom Clements was killed as he answered the door to his home Tuesday night in Monument,

El Paso County sheriff's investigators were looking for a late-model car, possibly a Lincoln or a Cadillac, that a neighbor spotted near Clements' home around the time of the shooting. Lt. Jeff Kramer refused to say what other clues may have been found after Clements' neighborhood was canvassed by officers.

Denver's KMGH-TV reported Thursday that Clements may have put a bicycle up for sale for $1,200 on Craigslist.

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