premise: The letter received by Syracuse TV station News 10 Now is still being analyzed, but police believe it was written by 41-year-old Jiverly Wong, police chief Joseph Zikuski said at a briefing.  "We have no reason to believe it's not (authentic)," Zikuski said. "It's another piece of evidence in a very complex puzzle that's going to take us weeks and months to determine what's going on. It's going to help us. "  In the rambling, disjointed letter mailed the day he gunned down 13 people before killing himself, Wong blamed his troubles on the police and vowed to take at least two people "to return to the dust of earth." He ended the letter, neatly written in capital letters, on a chilling note: "And you have a nice day."
hypothesis: Jiverly Won was a police chief.