The JonBenet Ramsey case, day-by-day

January 6: Classmates of JonBenet return to school where teachers and counselors help them cope with her death.

January 7: Police announce the search warrant of the Boulder home has been sealed. Evidence seized from the house won't be made public for at least a month.

January 8: Reports emerge that a "practice" ransom note was written.

January 9: Boulder Police Chief Tom Koby goes before reporters to defend his department's investigation, reassure residents that they are safe and decry "a barrage" of media coverage.

January 10: Police records reveal that a 911 call was placed from the Ramsey home on December 23, three days before JonBenet was found dead. Authorities later learn it was a nonemergency call mistakenly made by a drunken party guest.

January 13: The Globe, a supermarket tabloid, publishes stolen crime-scene photos.

January 14: The Globe agrees not to run additional coroner photos in exchange for keeping the rights to the published photos. It also agrees to return the seven published photos to investigators as well as two photos not yet printed.

January 15: A former sheriff's deputy and a photo lab employee are arrested on charges of leaking the JonBenet photographs to the Globe.

Janaury 21: Boulder police, without elaboration, say they have narrowed their list of suspects. A report also surfaces that the $118,000 demanded in the ransom note matches a work bonus John Ramsey recently received.

January 22: The Denver Post reports that police have asked the Ramsey family to submit to polygraph tests. The family refused, the newspaper reports.

January 24: CNN learns that Boulder police have obtained handwriting samples from "about a half-dozen" employees of Access Graphics, the company headed by John Ramsey.

January 28: The Boulder County attorney's office wants a court hearing date set to determine whether the coroner's autopsy report on JonBenet should be sealed.

February 12: A report surfaces that police have collected hair and blood samples from Bill McReynolds, a former University of Colorado professor who played Santa Claus at a party in the Ramsey home three days before the slaying.

February 14: A Boulder County judge allows portions of the autopsy report unsealed and orders the rest of the document to remain sealed for 90 days or until a suspect is arrested.

February 15-16: Colorado detectives return to Atlanta to interview friends, relatives and acquaitances of the Ramseys.

February 19: Family spokesman Pat Korten tells CNN that investigators have asked John Ramsey to submit a third handwriting sample.

February 25: A judge orders search warrants and related documents to remain sealed for another 90 days or until an arrest is made. Also, Ramsey family spokesman Pat Korten says police apperently view John Ramsey as the main suspect.

February 26: Police, without elaboration, announce they have questioned friends and relatives in West Virginia, where JonBenet's mother grew up.

February 27: Boulder District Attorney Alex Hunter says police are reexamining the alibi of JonBenet's 20-year-old half brother, John Andrew, who was reportedly in Georgia at the time of the murder.

March 6:  Authorities announce that two older half-siblings of JonBenet, John Andrew and Melinda, have been cleared as suspects in the slaying. Investigators say they decided to go public with the news to relieve the siblings of "stress caused by inappropriate speculation."