He is currently being held at the Fort Worth jail with a $1 million bond.
Police have not yet released Heath's mugshot. According to the school's website, Heath is an eighth grade science teacher who was in his first year at the middle school. Prior to that, he served 13 years in the U.S. Air Force.
The murder victims have not been identified. Police had initially detained another man for questioning in the case but he was not arrested.
Cedar Hill ISD said Monday night Heath has been placed on administrative leave.