two months after the death of ann palmateer, the toxicology results are in. her death had nothing to do with an accidental drug overdose and everything to do with her enlarged heart. >> turned out that the toxicology showed low levels of an antidepressant, celexa is the trade name. the levels were very low and wouldn't have played a role at all. she died of what we call hypertensive heart disease, an enlargement of the heart, generally because of high blood pressure. she's also an obese woman and that certainly would have played a role on her underlying heart disease. >> final diagnosis hypertensive heart disease. 510 grams. >> and then there are the occasional cases that may never be resolved. toxicology on charles krueger jr. yields unexpected results. >> he has no evidence of acute alcohol intoxication. and that was concerning for me. most of the time alcoholics who fall and sustain fatal injuries are intoxicated at the time of the injury. >> police work uncovered information that the man had had a seizure one day before his death and was treated at a loca