On March 9, 1873, in Salisbury, Maryland, after school, Miss Mary Amelia Shockley was walking with four small children. She was approached by a Mr. Hall and shot. The Schoolmaster ran out, but Miss Shockley was dead instantly. Hall threw himself under a train that night.
To help honor Miss Shockley
National Memorial to Fallen Educators 
With all due respect, you should know that Miss Mary Amelia Shockley appears to have been a 14-year-old student, not a teacher. See https://www.findagrave.com/memorial/156613596 for more information.