COLUMBUS — The Ohio Parole Board denied the release Tuesday of a woman convicted in the 1990 slaying of her sister-in-law.Seven of the eight members of the board heard the case against Sheila Hagen. She is serving a life sentence for the murder of her brother's wife, Darlene Crawford. Hagen, her brother, James Crawford, and his girlfriend, Amy Northern, were convicted in the slaying. James Crawford is scheduled for release in 2016.Crawford hired his sister and Northern to carry out the slaying, said Prosecutor Juergen Waldick, who did not prosecute the case but appeared before the board to fight to keep Hagen in prison. The board agreed to review Hagen for parole in another three years, Waldick said.Darlene Crawford, 36, was a teacher who Hagen and Northern killed while Northern was in the middle of an affair with Darlene Crawford's husband.Darlene Crawford was a third-grade teacher at Washington-McKinley Elementary School. Her body was found April 30, 1990, inside her car, which was abandoned on Garford Avenue in Fort Shawnee. Crawford had been hit with a blunt instrument and strangled. A bicyclist discovered the body.Northern, who was 20 at the time of the crime, was released in August 2005. She had pleaded guilty to murder. James Crawford was 40 years old at the time of the murder.You can comment on this story at www.limaohio.com.