One of four people charged in the shooting death of a Minnetonka High School student in a St. Paul alley has joined two others in pleading guilty to their roles in the girl's killing last fall.

Christopher R. Calloway, 33, of South St. Paul, pleaded guilty in Ramsey County District Court last week to second-degree murder and first-degree robbery in connection with the death of 16-year-old Samantha Burnette. Calloway remains in prison ahead of sentencing on Aug. 8.

Davonte Bobo, 24, of West St. Paul, and Vincent R. Harris, 30, of St. Paul have also pleaded guilty and await sentencing. A trial for one defendant, Kalisa C. Smith, 29, of South St. Paul, is scheduled for late June.

Smith, who allegedly drove the men to the scene, is accused of setting up the confrontation as part of a robbery plot.

The charges against the four allege that Burnette, her sister Brittany Rock, Smith and another woman were in a car in the 700 block of Sims Avenue on Sept. 25, when the three men approached.

Calloway pistol-whipped Burnette's sister, prompting Burnette to hit him in the head with a liquor bottle, the charges read. Calloway and Bobo started shooting, and Burnette was killed, according to prosecutors.

In the days after Burnette's death, family described her as an optimistic high school junior.