JonBenet Ramsey, Murdered Child Beauty Queen, Would Have Turned 21 Years Old, Saturday (PHOTOS)

Fifteen years have passed since JonBenet Ramsey was killed in her Boulder, Colo. home over the Christmas holiday and the brutal murder of the child beauty queen still remains unsolved to this day. Had JonBenet lived, she would be turning 21 years old this Saturday, August 6.

On Dec. 26, 1996, 6-year-old JonBenet was found bludgeoned and strangled to death in the basement of her family home. A ransom note from an anonymous group of individuals "that represent a foreign faction" asking for $118,000 in exchange for the safe return of JonBenet was found just hours before, but no call ever came from a kidnapper and it was never linked to a murderer. See the full text of the ransom note originally published by Vanity Fair magazine here.

John and Patsy Ramsey, JonBenet's parents were prime suspects for years and repeatedly appeared on news channels defending their innocence and demanding justice for the murder of their young daughter. The entire Ramsey family was cleared of any involvement in the murder of JonBenet back in 2008, thanks to then newly discovered DNA evidence, according to 9News. Patsy Ramsey, JonBenet's mother, died 2 years earlier in 2006 of ovarian cancer, tragically, she was still considered a possible suspect when she died.

Beginning in 2010, investigators reopened the case and launched a fresh round of interviews with witnesses that could provide more insight into the murder, according to ABC News, but nothing fruitful came of those interviews.

The DNA evidence still points to an "unexplained third party" that serves as a vague lead for authorities still pursuing the case, TIME magazine reported.

According to 7News, Boulder police have tested more than 150 DNA samples and investigated nearly the same amount of potential suspects in their ongoing investigation, but none have ever been linked to the crime.

After all these years, Boulder police have received thousands of tips about her murder and still receive several monthly. Boulder District Attorney Stan Garnett said in 2010 that he personally gets five or more tips each month, according to Fox31. The ones that have potential are passed along to Boulder police's Major Case Unit. There have been plenty of false leads as well, including most famously Mark Karr -- who bizarrely admitted to being with JonBenet the night of her death, but DNA evidence later cleared him of any wrongdoing in this case, MSNBC reported. Craig Silverman, talk radio legal analyst on 630 KHOW that has covered the unsolved murder since it first broke, spoke to Fox31 about the public's interest in the case:

It's an enduring, epic mystery. Everybody would like to know who killed little JonBenet.

Silverman went on to say on his Huffington Post blog, "This JonBenet murder mystery has never been lacking for clues. There are too many clues. It is putting all the puzzle pieces together that matters."

It remains one of the most notorious murders in U.S. history and a decade and a half later there is still no justice for JonBenet.

For a full timeline of the events of the unsolved murder case during its peak years in the 1990s check out the Daily Camera's chronological summary of the major events form Dec. 1996 to 1999.