SANTA ANA, Calif.—Mater Dei High School president Father Walter E. Jenkins will not return to the coed Catholic campus when classes resume after the winter break, ending his tenure after less than six months. His resignation comes just as attorneys for a Sacramento law firm prepare to begin interviewing students and staff for an investigation into alleged hazing by players on the school’s vaunted football team, but officials said Jenkins’s decision was not connected to the pending interrogations. Jenkins, who has extensive leadership experience in secondary education, was Mater Dei’s third president in two years. He was previously president of Holy Cross High School in Queens, New York. Diocese of Orange superintendent of schools Erin C.O. Barisano sent a letter to parents dated Jan. 1 explaining Jenkins was not fired but was instead returning to the Holy Cross order in South Bend, Ind., where he will “take on a new …