POTOMAC, Md. (WUSA) -- Three people, including a store supervisor, have been charged in two armed robberies at a CVS in Potomac.

Thirty-five-year-old Fenton James Graham of Silver Spring, 53-year-old Michael Dennis Cooke and 29-year-old Michelle Allison of Randallstown (who is Graham's girlfriend) were arrested in connection with the store robbery, say Montgomery County Police.

According to police, Graham was working as a supervisor during both robberies at the 7955 Tuckerman Lane store. The first robbery occurred on February 6. The second robbery happened on February 13.

Police say in the first robbery, a suspect who was later identified as Michael Cooke, came into the store greeted Graham and another employee "in a friendly manner" but then took out a gun and struck the other employee in the face with the handgun. Cooke then allegedly told Graham to tie up the other employee and then put money from the registers into a duffle bag, say police. Cooke then reportedly left the store with the cash. The employee who was pistol-whipped was taken to a hospital with a laceration to his mouth.

On February 13, police say Cooke came back again, showed a gun and demanded cash. He received the money and was seen getting into a vehicle.

Police realized that Graham was at the store during both robberies and he became a suspect. On February 14, he was arrested pursuant to an arrest warrant and charged withconspiracy to commit robbery, conspiracy to commit first-degree assault, use of a firearm in the commission of a violent felony, and theft.

Police believed that Michael Cooke, the father of Graham's girlfriend Michelle Allison, may be the suspect who committed the robberies. On April 2, US Marshals arrested him in Las Vegas, Nevada pursuant to a Maryland arrest warrant. He is still in custody in Nevada pending extradition to Montgomery County, according to police.

As for Michelle Alison, she was arrested on February 18 and charged withobstructing and hindering in the investigation.

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