Oklahoma City police are searching for a fourth suspect in a recent convenience store robbery.
Police said several people robbed the Phillips 66 station near N.W. 17th and Classen on April 4.
Detectives released the surveillance video and arrested three people. Now, they have filed an arrest warrant for a fourth suspect, 19-year-old Julian Whipple.
The arrest warrant for Whipple said he held a knife while De'Anthony Johnson held a gun to the store clerk.
The clerk did not want to be identified, but told News 9 it was 10:30 p.m., and he was working alone when the men walked in.
In the video, you can see a man who police identified as Whipple hang back at first, then pull a knife.
Later, you can see the flash of the knife while the clerk puts the cash register money into the bag.
The arrest warrant said Dorhee Wofford held the store door open and acted as a lookout while Maurice Beaumont waited in the getaway car.
Detectives arrested Beaumont, and they said in court documents he confessed to the crime, then positively identified Whipple as one of the suspects.
If you know where to find Whipple, call crime stoppers at 405-235-7300.