JACKSONVILLE, Fla. -- New information is coming out about a man police said shot and killed Episcopal High School's Head of School Dale Regan Tuesday afternoon before turning the gun on himself.

According to the Jacksonville Sheriff's Office, officers identified the shooter as former Episcopal Spanish teacher Shane Schumerth, 28.

After lunch,Schumerth, who had been fired earlier in the day, returned to Episcopal's campus, according to JSO Undersheriff Dwain Senterfitt.

"He went to the headmaster Dale Regan, basically had an assault rifle in a guitar case. He (Schumerth) shot and killed Miss Regan and then he killed himself," said Senterfitt.

"We thought he was a very intelligent, very perceptive, very talented young man," said John Winkler.

Winkler is the President of Concerned Taxpayers of Duval County. He described Shane Schumerth, the man police said shot and killed Episcopal Head of School Dale Regan.

"There was absolutely nothing that any of us ever saw that would indicate he was either capable, even capable of contemplating the kind of action he took today," Winkler said.

Winkler said Schumerth was active in the organization for about a year while he was a teacher at John E. Ford.

"He was very concerned about school board issues there," Winkler said. "The same things concerned taxpayers are interested in."

According to documents from Duval County Public Schools, Schumerth resigned from his position at John E. Ford effective June 2010, citing personal reasons.

DCPS documents also listed Schumerth on a 'Do Not Hire' status they said he violatedan agreement in which he received bonus payment of $1,000 for agreeing to remain with DCPS for three years.

Schumerth was certified by the Florida Department of Education to teach Pre-K through 3rd grade, the department's website showed. That certification was valid from July 2011 to June 2016.

A statement on the Episcopal High School website welcomed Schumerth as a new teacher in Aug. 2010.

"I had Mr. Schumerth last year as a teacher, and it's really weird to think about because I was in a room with him for an entire year," said Camille Henley, and eighth grader at Episcopal.

Henley is now questioning if there were warning signs.

"Was there nothing we could have done?" she asked.

Winkler said along with grieving for the Episcopal family, he is also grieving for Schumerth's family.

"One insane extreme act at the end of an all too short life," Winkler said.