>> did you find anything the second time around? >> in the tissue was a concentration of the drug but no injection point. >> the coffee theory is starting to make more sense? >> starting to look pretty good. or some type of beverage. absolutely. >> meanwhile, gill was free. his dental practice thriving. the public had no idea he was a murder suspect. but he did confided in his staff. >> i remember him telling us that he was innocent. and that we needed to just work hard to keep the office opened. i knew the kind of person that he was that. >> gil's life moved on. a year turned into two, then three. >> it's been really very hard for him. i think the only way he's been able to keep on is that he now