A Bellefonte woman is dead following a hit and run accident along I-99 in Centre County early Tuesday morning.  Police say the victim identified as Sherry Houtz was hit sometime between 3:45 and 4 am.  Investigators are trying to piece together why she was walking along the highway in the middle of the night.  They are looking for a pickup truck or car with front end damage believed to be involved.  Investigators say Houtz was last seen at this nearby Sheetz along Benner Pike.