Joseph Soldwedel claims he was poisoned with thallium, a tasteless, odorless heavy metal formerly used in rat poison.
It's not clear whether Soldwedel was poisoned intentionally, but Prescott police say they're investigating the situation as a criminal matter.
No arrests have been made. Soldwedel says he has a “good idea” who may have poisoned him, but says he's keeping quiet until police finish their investigation.