TribLIVE's Daily and Weekly email newsletters deliver the news you want and information you need, right to your inbox. Following a fourth positive covid-19 case at Valley Junior/Senior High School in New Kensington, the New Kensington-Arnold District announced the school will be closed Monday. The district said the decision was made in accordance with Pennsylvania Department of Education and Department of Health guidance. The building will operate using the fully virtual model. Although the building is cleaned on a daily basis, additional resources will be placed in the building tomorrow to ensure a safe return on Tuesday, according to a district statement.