and dan goodwin himself provided a dna sample. he had gone out with laura a few days before the murder. goodwin maintained it was a casual date and said the two weren't intimate. >> since i took her out to the movies just four days before and knew her, they decided it would be advisable to test my dna. it was tested, and i was not present at the crime scene. >> at least the investigators had the killer's dna, and they were closer to finding him. a lot closer than they knew. people don't have to think about where their electricity comes from. they flip the switch-- and the light comes on. it's our job to make sure that it does. using natural gas this power plant can produce enough energy for about 600,000 homes. generating electricity that's cleaner and reliable, with fewer emissions-- it matters. ♪ does it end after you've expanded your business?? after your company's gone public? and the capital's been invested? or when your company's bought another? is it over after you've given back? you never stop achieving. that's why, at barc