FARMINGTON — A man and woman pleaded guilty to robbing the Sonic Drive-In in Shiprock at gunpoint last year.

Jerrileta Singer, 32, pleaded guilty Thursday to a robbery charge. She faces up to 15 years in prison at her sentencing hearing, which has not been scheduled yet.

Eddie Shirley, 28, was the co-defendant in the case. He entered a guilty plea on June 25 to a weapons charge for his role in the November robbery.

He will be facing a minimum sentence of seven years in prison at his sentencing hearing in September.

Shirley and Singer entered the Sonic near closing time on Nov. 30, and Shirley pointed an AK-47 at a manager and demanded money, according to court documents.

Singer stayed near the restaurant's door during the robbery, according to the documents.

Both Shirley and Singer wore masks and hooded sweatshirts to disguise themselves.

Sonic employees said they gave the robbers about $400. The robbers then left in a light-colored sedan, which investigators determined belonged to Singer's mother.

Shirley was a former Sonic employee who was fired days before the robbery, according to court documents.

Ryan Boetel covers crime for The Daily Times. He can be reached at 505-564-4644 and rboetel@daily-times.com. Follow him on Twitter @rboetel on Twitter.