>> well we were going to do whatever it took to get the evidence that we needed. we're. >> we're still looking for a source or how it entered his body. we don't have an explanation for tat. there was talk possibly gil had treated tom for some type of abscess or infection in his mouth. so the medical examiner was looking in this jaw and mouth area for possibly an injection site we initially wouldn't have thought to look for on the first exhumation. >> did you find anything the second time around? >> in the tissue there was a concentration but no injection point. >> reporter: meanwhile, gil was free his dental practice thriving. the public had no idea he was a murder suspect, but he did confide in his staff. >> and i remember him telling us