OAKLAND, Calif. — A 23-year-old California woman and her boyfriend have been accused of killing an Alameda County Sheriff’s Office volunteer.

The East Bay Times reports that Sheriff’s Office Explorer Karla Ramirez-Segoviano’s body was found beaten, stabbed, burned and discarded in a creek in East Oakland on Thursday.

Prosecutors on Monday charged Laura Rodgers, a former friend and co-worker of the victim, and Rodgers’ boyfriend, Curtys Entoine Taylor, with murder.

According to court documents, Rodgers told police she had planned the murder and discussed it with Taylor beforehand. Police allege Taylor was waiting with a can of gasoline when Rodgers stabbed and beat Ramirez-Segoviano, and that he poured the gasoline over the victim, the paper reports.

“The fact they planned to kill this poor girl shows how much disdain and malice the suspects had toward Karla,” Sheriff’s Office spokesman Sgt. J.D. Nelson told the paper. “Hopefully, when this case is finally adjudicated, a judge will have the same disdain for them during sentencing.”

A possible motive for the killing has not been released, but police believe it was unrelated to Ramirez-Segoviano’s work as a police explorer.