i m thinkin , holy cow. reporter: three weeks before heidi s murder, an officer had spotted alexander bennett walking down a baltimore highway. when a wanted check is run by a patrolman or an officer that check remains in the computer forever. how important was that? incredibly important. reporter: detectives meyer and childs hopped a flight to denver. it was time to meet this alexander bennett. coming up a suspect s story, a surprise to even these experienced detectives. i ve got to tell you it s strange. that s why it is strange. when indiscretion continues. strange. when indiscretion continues. st drive works. they give their customers seven days. and if they don t like it, they give em their money back. wait, they take the car back? that s crazy! what if it was driven by like a zookeeper? or a mud wrestler? or a guy who s on the outs with the missus and he just needs a place to sleep for seven days? yeah. (vo) buy your car online. love it or return it.