Later developments

In December 2003, forensic investigators extracted enough material from a mixed blood sample found on JonBenét's underwear to establish a DNA profile. The DNA belongs to an unknown male.

The DNA was submitted to the FBI's Combined DNA Index System (CODIS), a database containing more than 1.6 million DNA profiles, mainly from convicted felons. The sample has yet to find a match in the database, although it continues to be checked for partial matches on a weekly basis.

Later investigations also discovered that there were more than 100 burglaries in the Ramseys' neighborhood in the months before JonBenét's murder, and that 38 registered sex offenders were living within a two-mile (3 km) radius of the Ramseys' home, an area that encompasses half the population of the city of Boulder, but none of the sex offenders had any involvement in the murder.