Story highlights Conrad Alvin Barrett convicted of federal hate crime

Cellphone video shows 2013 attack in Katy, Texas

Roy Coleman suffered two jaw fractures in the incident

(CNN) The U.S. Justice Department has released cellphone video of a so-called "knockout game" attack that resulted in a federal hate crime conviction.

Conrad Alvin Barrett, 29, of Katy, Texas, was sentenced to almost six years in prison last month after pleading guilty to taking part in the bizarre game where an assailant aims to knock out an unsuspecting victim with one punch.

On Friday, officials released Barrett's video which shows him narrating and then attacking an elderly African-American man.

Roy Coleman, 81, suffered two jaw fractures and was hospitalized for several days after the November 2013 incident.

In his own cellphone video, Barrett is heard talking about the attack. "The plan is to see if I were to hit a black person, would this be nationally televised?" On the video, Barrett says he's "completely unable" to hit defenseless people, but then the car stops.

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