San Francisco ? John Mark Karr, who was briefly a suspect in the JonBenet Ramsey slaying, arrived in California late Tuesday to face child pornography charges, authorities said.

Karr, 41, who had been held in Colorado for several weeks, was released by Boulder County authorities earlier Tuesday.

Karr, a schoolteacher, was arrested Aug. 16 after he made phone calls and wrote e-mails in which he claimed to have killed the 6-year-old beauty queen in her Boulder home in December 1996. But DNA tests failed to connect Karr to the crime, and investigators had no evidence he was even in Boulder at the time of the slaying.