John Mullen died this past summer, but police are just now getting back test results that prove he had ingested a huge dose of arsenic. The substance is tricky. It can be lethal, but causes the same symptoms as a natural illness -- things like vomiting, diarrhea and abdominal pain. Mullen had been complaining of an upset stomach the day he died. Now that they have the cause of death, investigators are starting to look for a murderer. But so far, they are refusing to discuss any possible motives or people who may have been involved. Mullen mostly lived alone, but was letting a girlfriend's daughter stay with him at the time that he became ill.
Missouri police say nuclear scientist killed by poisoning
CHESTERFIELD, Mo. (AP) - Police in Missouri say someone fatally poisoned a nuclear scientist.
