ANTIOCH -- Leadership changes are on the way at the elementary school where alleged child abuse in a special education classroom earlier this year -- and failure to report it to police, as the law requires -- led to the accused teacher's resignation and prompted a criminal investigation and federal lawsuit.

The latest administrative move at Mno Grant Elementary came two weeks ago, as Antioch Unified trustees approved the reassignment of former Principal Michael Green to a teaching position. Green had been on leave since March 22.

Superintendent Donald Gill described Green's new job as a "nonclassroom teacher on special assignment" in which he will help plan the district's efforts to continue to grow its high school Linked Learning and districtwide STEM programs.

Janeen Zuniga, a middle school vice principal at two Antioch schools, was recently named Grant's principal for the upcoming school year.

Meanwhile, the Contra Costa District Attorney's Office has not determined whether criminal charges will be filed.

"We didn't expect it to go on this long," Antioch Unified board President Joy Motts said.

On March 16, Antioch police presented a case involving a student to the District Attorney's Office against Special Day Class teacher Theresa Allen-Caulboy.

Though state law requires school employees to report any suspicion of child abuse to authorities, the parents in this instance brought the case to police.

After review, the case was returned to the Police Department for some follow-up investigation, according to police and District Attorney's Office officials.

Police plan to resubmit the case soon, Lt. Diane Aguinaga said.

Allen-Caulboy, 55, of Brentwood, was placed on administrative leave Jan. 18 and resigned Feb. 13. She had been teaching at Grant since August 2011.

The district, Green, Allen-Caulboy, Special Education Director David Wax, Assistant Superintendent of Human Resources Keith Rogenski and Special Education Coordinator Kai Montgomery were all named in an April civil suit that alleges Allen-Caulboy slapped, pinched and verbally abused three autistic students, and school officials failed to quickly report the accusations to police as the law requires.

All school employees who work with children are "mandated reporters" with a legal duty to report any suspicions of abuse to police or Child Protective Services immediately by phone, and then through a written report within 36 hours.

Antioch Unified held mandated reporter trainings for all staff at every school in the district in the months after the incident, and there has been more emphasis and discussion on campuses about it.

The decision to move Green, Grant's principal for the past three years, was suggested by district staff and approved by the board at its June 26 meeting, Rogenski said.

Though the district has been mostly mum because of the ongoing investigation, citing personnel confidentiality, Motts said: "We felt it was fair for the district and for Mr. Green until the DA figures out what's going on here."

Green said he could not comment on the matter.

Peter Alfert, the attorney representing the plaintiffs in the civil suit, said he is awaiting the decision by the District Attorney's Office.

"I would like to hear what transpired," he said.

Wax retired from the district in May after one year, and Karen Mates was hired as Antioch's new director of Special Education. Montgomery was appointed vice principal at Dallas Ranch Middle School.

Three teacher's aides and a substitute instructional aide involved in the incident remain on administrative leave, Rogenski said.

Staff writer Matthias Gafni contributed to this story. Contact Paul Burgarino at 925-779-7164. Follow him at Twitter.com/paulburgarino.