ST. JOHN — St. John High School is mourning the loss of a talented musician and actor and his mother who served as an elementary school paraprofessional.Linda Gleason, 56, and her son, Jeffrey Gleason, 17, died Tuesday when an apparent tornado toppled a cottonwood tree and crushed their vehicle off U.S. 281 in Stafford County. St. John Principal Mike Burgan said the Gleasons will be missed. He said Linda worked admirably as a paraprofessional in special education, a job that requires unique skills.