Eric Martin Minchak, accused of using a knife in the death of a woman at a Roseville gas station in 2006, has been placed under the conservatorship of Placer County and sent to Napa State Hospital for continued mental health care, the Placer County District Attorney's Office announced today. Minchak, 31, of Pennsylvania has spent the last three years in Atascadero State Hospital after a judge ruled that he was mentally incompetent to stand trial on charges of robbery and the first-degree murder of the victim, a DA's news release states. Prosecutor David Broady of the Placer County