The father of slain child beauty queen JonBenet Ramsey says "unskilled and unknowing" Boulder investigators have wasted two years chasing the wrong suspects in his daughter's murder.

In a letter faxed to news organizations Monday, John Ramsey blasted the city's police force."We don't fault you for initially including us under your `umbrella of suspicion,' but we will forever hold you accountable for following a theory rather than the evidence," he wrote.

Boulder police declined to comment on the Ramsey letter.

The criticism follows a Sept. 20 resignation letter from investigator Lou Smit in which he argued that John and Patsy Ramsey had been unfairly targeted by police.

Police Chief Mark Beckner emphatically denied Smit's claim Sunday, saying, "If he's aware of who the perpetrator is, I wish he'd let everybody know."