In February 1999, fifteen-year-old Sonya Christene Wallace left her mother’s home in Rockdale, Texas to walk four blocks to the post office. She left around 5:30 p.m.

She never came back.

Initially labeled a runaway by local authorities, Sonya’s disappearance received little urgency. Her family insisted that something was wrong. Weeks passed without answers.

On March 14, 1999, a rancher discovered the body of a teenage girl beneath a bridge in southeastern Williamson County, close to the Lee County line. The remains were badly decomposed. DNA testing later confirmed it was Sonya Wallace.

Her death was ruled a homicide caused by blunt force trauma to the head.

Investigators believed Sonya was killed elsewhere and her body transported to the creek bed where she was found, approximately 25 miles from where she disappeared. Evidence collected included her clothing and soda bottles from the scene. Detectives stated early on they believed Sonya likely knew her killer.

A previous case involving two young men who had been arrested months earlier in connection with inappropriate contact with Sonya surfaced during the investigation. One was incarcerated at the time of her death. The other had been released from jail just eleven days before she vanished. No arrests were ever made in Sonya’s murder.

Over the years, investigators conducted between 150 and 200 interviews. Crime Stoppers rewards were offered. Sonya’s father created a website dedicated to her memory, hoping someone would come forward.

In 2017, the Williamson County Sheriff’s Office established a Cold Case Unit. Sonya’s case was reopened and reexamined from the beginning. Detectives retested evidence using modern DNA techniques and reinterviewed hundreds of people connected to her life. Investigators now believe she may have been planning to meet someone the night she disappeared, and they have stated there is no evidence she ever reached the post office.

More than two and a half decades later, Sonya Wallace’s murder remains unsolved.

If you have information about the murder of Sonya Christene Wallace, please call the Williamson County Sheriff’s Office Cold Case Unit at (512) 943-5204.

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