Dallas-based Oak Farms Dairy is offering the reward for clues leading to solving the Tuesday morning death of 83-year-old Leona Faye Swafford.
An Arlington police statement says a man approached and assaulted the woman as she pulled into her driveway. After a struggle, the assailant drove off in the woman's car with her inside.
Police say the woman's body was found around about 1 1/2 hours later, dumped a couple miles from her home. Her car was later found abandoned in an apartment parking lot.
Police say the victim suffered head trauma. An autopsy has been ordered.
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