According to State Police, Mary Scott was traveling south on Route 119 around 11:30 Sunday evening when she crossed the center line and into the path of a semi with tank trailer.
The driver of the tank trailer, a 59-year-old man from Brookville, was not injured but his vehicle was disabled from the crash.
Police say Scott was not wearing her seatbelt and died at the scene. The road was closed for three hours while police investigated.
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