UPDATE: DNA Match on Beverly Rd. Station Chain, Fox Murder Scene Product of Lab Mess-up

Update: Thursday, July 12, 9:04 a.m.: DNA evidence thought to link a chain left by Occupy Wall Street protesters at the Beverly Road train station earlier this year to the 2004 murder scene of 21-year-old Sarah Fox was actually the product of a lab mess-up, The Daily News reports. 

The same NYPD employee processed evidence from both cases and "will likely face departmental charges for not taking precautions to prevent tainting," a source told the News. 

The identity of the NYPD employee who tainted the evidence was not released, but it should be noted that both the Medical Examiner's office as well as the NYPD has DNA of its workers on file so it can avoid mixups.

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NBC 4 New York originally reported a chain left by Occupy Wall Street protesters at the Ditmas Park subway station had been linked to the 2004 murder scene of a 21-year-old Juilliard student.

DNA evidence from the scene of Sarah Fox's murder eight years ago had been falsely connected to DNA from the chain left at the Beverly Road subway station by OWS protesters in March.

Fox was found nude and strangled in Inwood Hill Park park in May 2004, days after disappearing during a daytime jog. Investigators found her pink CD player in the woods just yards from her body.

NBC 4 New York reported that sources said the DNA found on the CD player matched DNA found on the chain.

No immediate evidence suggested that the DNA belonged to the protesters who chained open the gates, but Dr. Lawrence Koblinsky, a forensics expert at John Jay College of Criminal Justice, said the DNA link could potentially break the Fox cold case. He also noted the likelihood is high the person who left that DNA on the CD player is the killer of Sarah Fox.

In March, Occupy Wall Street protesters chained open emergency gates and taped up turnstiles in eight subway stations, including Beverly Road, and posted fliers encouraging passengers to enter for free.