MUS-2026-0482
Archive card
MUS-2026-0482
Homicide
- Incident
- 1999
- Indexed
- Oct 26, 2026, by MuseUnsolved
- Agency
- Williamson County Sheriff's Office
- Location
- Rockdale TX
Public record. Index entry.
Index entry. Case details compiled from public reporting; our researchers have not verified this file yet.
Summary
What happened, as the record shows.
Sonya Christene Wallace, 15, left her mother's home in Rockdale, Texas, about 5:30 p.m. in February 1999 to walk four blocks to the post office and never came back. 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. DNA testing confirmed the remains were Sonya Wallace, and her death was ruled a homicide caused by blunt force trauma to the head. Investigators conducted between 150 and 200 interviews and Crime Stoppers rewards were offered, but no arrests were ever made in her murder. In 2017 the Williamson County Sheriff's Office Cold Case Unit reexamined the case from the beginning, retested evidence using modern DNA techniques, and reinterviewed hundreds of people connected to her life.
Timeline
What the record establishes.
- 1999
In February 1999, about 5:30 p.m., Sonya Christene Wallace leaves her mother's home in Rockdale to walk four blocks to the post office and never comes back.
- 1999
On March 14, 1999, a rancher discovers the body of a teenage girl beneath a bridge in southeastern Williamson County, close to the Lee County line.
- 1999
In late March 1999, DNA testing confirms the remains are Sonya Wallace, and her death is ruled a homicide caused by blunt force trauma to the head.
- 1999
Investigators conduct between 150 and 200 interviews and Crime Stoppers rewards are offered; no arrests are ever made in Sonya's murder.
- 2017
The Williamson County Sheriff's Office Cold Case Unit reexamines the case from the beginning, retests evidence using modern DNA techniques, and reinterviews hundreds of people connected to her life.
Key people
The people in the file.
15, of Rockdale, Texas. Left home to walk to the post office in February 1999 and never returned; her death was ruled a homicide from blunt force trauma to the head.
Contact details change over time; confirm the current assignee before publishing.
Investigating agency
Where tips go.
This case is with the Williamson County Sheriff's Office. If you know something, say something to them. For public-record leads for our researchers, use the tip line on any open file.
Coverage
Coverage and further reading.
Continue