WAS IT A guilty conscience? His motive is unclear but in a homicide case that generated zero suspects after four hard years, detectives will take what they can get. Kirk Jared Rivers, 22, on the left, calmly walked into Sacramento County Sheriff’s department Monday morning bearing a note in which he claimed responsibility for the 2007 killing of John Pogacar, 39, according to spokesman Jason Ramos. Rivers, 18 at the time of the killing, gave no immediate indication of his motive for the crime, nor for waiting four years to confess. Cops, naturally enough, were immediately skeptical.
