The Ashbel Smith Building is the oldest medical school building west of the Mississippi River and is the scene of at least one shooting. The 122-year-old building, known as Old Red thanks to its red brick and sandstone exterior, was also dangerously close to becoming a parking lot in the 1960s, author Heather Wooten said. Wooten, who attended classes at Old Red on her way to receiving a doctoral degree, will be speaking about her new book, “Old Red: Pioneering Medical Education in Texas,” on Thursday.