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BOULDER, Colo. (KDVR) – Boulder police are looking for three witnesses who may have important video of the deadly assault at the Circle K gas station on July 23 at about 5 p.m.

Police were called to the Circle K at 1480 Canyon Blvd. at 5:21 p.m. Upon arrival, the victim was unconscious and the suspect had fled the scene.

The victim was transported to the hospital where he was pronounced dead.

The suspect, 21-year-old Brian Farrar, was arrested on July 23. Court records show he is charged with manslaughter.

Anyone with information can contact Det. Matt Greer at: 303-441-4322.

To leave an anonymous tip, contact Northern Colorado Crime Stoppers at 1-800-222-TIPS (8477).

Tips may also be submitted through the Northern Colorado Crime Stoppers website.