so, if mary yoder is a bull's-eye, the first ring around that bull's-eye is bill yoder.ill denied any involvement in mary's murder. as police check to see if he could have purchased the murder weapon, colchicine, the case took yet another bizarre turn. an anonymous letter arrived at the medical examiner's office. an identical letter was sent to the sheriff. whoever wrote these letters had inside information on the investigation. the letter-writer specifically named what the toxin was, colchicine, which, at that point, very few people knew that. narrator: the letter-writer was in no doubt about who killed mary yoder. phelps: it points specifically to adam yoder, the son. and it also claims that adam yoder had motive to kill his mother -- that he was going to get some money out of this. narrator: the letter said the bottle of colchicine, the murder weapon, was under the front seat of adam's jeep. adam was called in for an interview with police and was stunned when told he was a person of interest in his mother's murder. we tell him that we would like to look in his jeep, u