New York ? John Mark Karr’s attorney filed a flurry of paperwork Friday to keep the JonBenet Ramsey murder suspect’s handwriting and DNA under wraps.

Public defender Seth Temin asked a judge to limit prosecutors from taking or testing Karr’s DNA for the time being, and to keep a legal document containing his signature secret – presumably so it can’t be compared to a rambling ransom note found Dec. 26, 1996, the day JonBenet’s strangled body was discovered in the basement of her family’s Boulder, Colo., home.

A judge scheduled Karr’s first appearance in Boulder County Court for Monday afternoon, a proceeding expected to last just moments.

Karr was arrested last week in Thailand on suspicion of killing the 6-year-old beauty queen, and could face murder, rape and kidnapping charges in Boulder. He told reporters in Bangkok that he was with JonBenet when she died and was flown to the United States in a bizarre spectacle that saw reporters track his every move.

In Boulder, though, the prosecutor has refused to say anything about the case. Judge Roxanne Bailin on Friday issued a gag order preventing everyone involved from talking about evidence or Karr’s statements.

Temin spent four hours with Karr on Friday in the Boulder County Jail, where he is segregated from the 500 other inmates for his own protection. Two California lawyers who had said they would represent Karr were nowhere to be seen, even though one of them, Jamie Harmon, claimed on CNN’s “Larry King Live” that she soon would visit Karr.

“If she wants to represent him, she should have spent the time in the taxi to the airport rather than on ‘Larry King,”‘ quipped state Public Defender David Kaplan.

Also Friday, Karr’s half-brother insisted the former teacher couldn’t have killed the girl.

“To the best of our recollection, he was either with us in Atlanta or with (his ex-wife) Lara” and their sons in Alabama, Nate Karr said on ABC’s “Good Morning America.”