A Burnet High School coach in under investigation for having an improper relationship with one of his students. 28 year old Jose Miguel Sierra has been arrested for allegedly have a relationship with at least one student. According to police, it all started when Sierra began "snap chatting" several of his female students. Apparently, this may have been going on for the last 2 years. Sierra just recently resigned from being the head baseball coach at the high school. School officials say once these incidents came to light they immediately notified the Burnet police department. Sierra has been charged with a felony and additional charges may be filed in the future.