JACKSON, Tenn. -- Jackson police believe a Union University student killed his fiancee and then tried to make her death look like a suicide.

WNWS-FM reported that Charles Pittman, a 21-year-old senior majoring in Christian ministries, is charged with first-degree murder and tampering with evidence.

Pittman's fiancee was Olivia Greenlee, a 21-year-old senior majoring in music education. She was found dead of a gunshot wound in her car on campus early Wednesday morning.

Police believe that Pittman shot Greenlee on Tuesday night and then staged the scene to look like a suicide.

Pittman's arraignment is scheduled Tuesday in Jackson City Court.

The Associated Press was unable to determine whether Pittman had obtained an attorney. Calls to the Jackson City Court went unanswered on Sunday, a message for Jackson police was not returned and jail officials refused to release any information on Pittman.

A statement from Union University President David Dockery called the shooting and arrest "incredibly devastating and saddening news."

Union is a private Christian liberal arts university with about 4,200 students.

Dockery said that crisis counselors are available on campus, and he asked students and staff to "pray for all the families connected to this tragedy."

An obituary for Greenlee said she was a native of Dyersburg, a member of the Union University Singers and a group leader for children's music camps and the Zeta Tau Alpha sorority.

Police have not yet said what they believe to be the motive for Greenlee's shooting.