James Hetfield of Metallica performs during the Download Festival in Castle Donington, United Kingdom.

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Metallica frontmant James Hetfield has filmed a public service video to aid law enforcement officials in tracking down a man suspected of murderering Virginia Tech student Morgan Harrington after the band's 2009 gig in Charlottesville, Virginia. Hetfield shared a police sketch of the suspect and urged fans to speak up. "Remember, any information – no matter how small you might think it is – could be that crucial piece investigators need to help solve the case," he says.

FBI officials have used DNA evidence found with Harrington's corpse to link her killer to a 2005 sexual assault in Fairfax City, Virginia. Police fear that the suspect is predatory, and may attack other women if he has not already. The Jefferson Area Crime Stoppers organization is offering $100,000 for any information leading to an arrest, and Metallica has put up a $50,000 reward.

You can watch Hetfield's video below.