(Oxford, MS) We're learning more about a former Yalobusha County, Miss., deputy sheriff, accused of killing his mother and younger brother in Oxford.
Twenty-five-year old Regis Mister served as a school resource officer in the same district where his mother was a principal.
Mister's arrest for the murders of 43-year-old Dr. Carol Gary and 12-year-old Patrick Gary, Jr., is hard for people to understand.
Regis Mister was reportedly living at the house on County Road 301, where police found the bodies of Gary and Patrick Friday morning.
Oxford Police said Mister was a "person of interest" early on, but so far no motive has been given for the killings.
Regis Mister is a former Yalobusha County Deputy Sheriff.
And Supt. Kim Chrestman said Mister was the School Resource Officer for the Water Valley School District in 2013 and part of 2012.
"We had a good relationship with Regis here. Just never saw this coming," said Supt. Chrestman.
News of Mister's arrest left most everyone in the Water Valley School system shaking their heads in disbelief.
Supt. Kim Chrestman said Mister was very organized and displayed many of the same qualities as his mother, Dr. Carol Gary, the principal at Davidson Elementary School.
"He patrolled the school, mainly at the high school. He did visit the elementary and alternative school. He was very professional," said Chrestman.
Monday morning students and teachers at Davidson Elementary came together to pray for Dr. Gary and her 12-year old Patrick Gary, the younger brother of Regis Mister.
Supt. Chrestman said he had a good working relationship with Mister and spoke with him daily about any problems in the schools.
"Especially if there was situation with violence. He did a really good job in helping us re-write our crisis management plan," said Chrestman.
Regis Mister is being held in the Lafayette County Jail in Oxford, Miss.
Mister was being investigated by the Mississippi State Auditor's Office.
We're told the office launched an embezzlement case against Regis Mister last June involving alleged misuse of a county fuel credit card.