olay. >> reporter: investigators in grovetown, georgia, now had a murder case on their hands.arsons had been assaulted and killed in a home invasion. and the house of her good friend becky next door had been ransacked too. is your door to door, your canvassing, coming up with anything? >> no. nobody -- nobody's seen anybody, you know, out of the ordinary in the neighborhood. >> reporter: so they turned to the first person in the neighborhood to notice something was wrong -- the contractor who'd alerted 911 -- first man on the scene. investigators had to wonder why he was really there. >> at this point everybody's a suspect, you know? you know, and logically he's the first one. >> reporter: edmunds brought him down to the substation for questioning, and they went through the story he had told at the scene. >> it was an -- and i walked down to the hall and i said, "hey, is anybody in there?" and anyway i didn't hear nothing. >> reporter: but you also have to ask him if that's really what happened. >> yes. >> reporter: i mean, he's the guy who discovers this violent criminal act,