The city's police chief dismissed accusations that the JonBenet Ramsey murder investigation has unfairly targeted her parents and failed to consider other suspects.

Lou Smit, a special investigator in the slaying, made the claim in a Sept. 20 resignation letter sent to Boulder District Attorney Alex Hunter and obtained by Newsweek magazine."Lou Smit has been on this case for how many months now, and I don't recall him ever presenting any arrest warrants to the DA's office," Police Chief Mark Beckner said Sunday. "If he's aware of who the perpetrator is, I wish he'd let everybody know."

In the letter, Smit told Hunter that JonBenet's parents, John and Patsy Ramsey, "did not do it" and urged Hunter to "wait and investigate this case more thoroughly," he stated.

Smit, formerly a detective with the Colorado Springs Police Department, came out of retirement in March 1997 to help Hunter with his investigation.

"I find that I cannot in good conscience be a part of the persecution of innocent people. It would be highly improper and unethical for me to stay when I so strongly believe this," Smit wrote Hunter.

JonBenet, 6, was found beaten and strangled in the basement of her family's Boulder home on Dec. 26, 1996.