HOUSTON -- Harris County Sheriff s deputies have arrested a man they say robbed a convenience store twice and surveillance video captured the suspect in action.

Gregory Arthur Williams, 24, was charged with aggravated assault with a deadly weapon.

Investigators said Williams robbed the Courtesy Mart in the 5500 block of North Highway 6 on December 19, 2012 and January 1, 2013.

On both days, he entered the store wearing a grey hoodie, hopped over the counter with a pistol and demanded money from the store clerk. Both times the clerk, fearing for his life, handed it over.

After the video was released to the news media, a family member called and told authorities Williams identity.

After the clerk was able to positively identify Williams from a photo lineup, a warrant was issued for his arrest.

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