A man suspected of ramming two Capitol police officers, killing one, before jumping out of the vehicle with a knife was caught on camera shopping for the weapon shortly before the incident.

READ MORE: Man suspected of ramming 2 Capitol police officers graduated from college in Virginia

Noah Green, 25, an Indiana man with ties to Virginia, was shot to death after he refused to drop the knife outside the North Barricade on Capitol Hill.

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Video FOX 5 obtained from District Cutlery shows Green shopping for the weapon.

According to the owner of the Union Market shop, Green paid $300 for the carving knife after shopping for around 20 minutes.

The owner says he only learned that Green had visited his shop after the FBI paid him a visit over the weekend.

William “Billy” Evans – an 18-year veteran of the Capitol police force – was killed in the attack.

READ MORE: U.S. Capitol Police officer, suspect dead after car rams into barricade

A second officer survived the incident.