Pregnant Teacher's Body Found After Alleged School Affair Arrested assistant principal Robert Marks has yet to talk By Elizabeth Armstrong Moore, Newser Staff Posted Jun 20, 2016 8:00 AM CDT 86 comments Comments Robert Marks, center, is escorted by Baton Rouge Police Department detectives on Friday morning in Baton Rouge, La. (INCLUDING GREATER BATON ROUGE BUSINESS REPORT, 225, 10/12, INREGISTER, LBI CUSTOM) (Newser) – A married middle school assistant principal has been arrested in the murder of a pregnant teacher with whom he was allegedly carrying on an affair in a case that's shaken Baton Rouge, La. Instructional specialist Lyntell Washington, 40, was seven months pregnant and the single mom to a 3-year-old daughter, reports the Advocate. Washington's body was found badly decomposed in an irrigation ditch last week after her daughter prompted investigators to search for her "sleeping" mother, who she said was "in the lake" after "Mr. Robbie" hurt her. Robert Marks, 39, the assistant principal at Brookstown Middle Magnet School, was originally charged with kidnapping and abandoning Washington's daughter in a parking lot the night of the murder, but he's now charged with murder and infanticide. He has yet to talk. In a recent text message to Marks, Washington asked if he was trying to get out of his responsibility for "our unborn child," according to a police affidavit. One of Washington's friends tells WAFB that no one missed any clues: "It's just that he was just who he was and we had no way of seeing that or knowing that. Some people are masterminds at deception." The school, meanwhile, is reeling, with Superintendent Warren Drake releasing a statement that Washington "will be remembered for the impact she had on the many lives she touched through her work in our district." The Advocate notes that Washington, whom friends call generous with her students even if she was struggling, lived in a one-bedroom apartment, needed a new car, had no working computer, and was pursuing a master's degree in education.