A former teacher at a prestigious girls' school, attended by some of Los Angeles' most affluent families, has been sued by a former student, alleging sexual abuse. An unnamed 30-year-old former Marlborough School student filed the lawsuit against Joseph Koetters, who taught English at the Hancock Park school which charges $35,000-per-year. The lawsuit alleges that when Koetters was in his early-to-mid 30s he took part in a yearlong sexual relationship with a 16-year-old student, which began in the 2000-2001 school year. Joseph Koetters, a former English Teacher at Marlborough School in Los Angeles, is being sued by an unnamed 30-year-old former student who alleges that he sexually abused her . In the lawsuit, unnamed teachers and school officials are held responsible for not ending the relationship, according to The Hollywood Reporter. Marlborough ignored allegations against Koetters at the two previous schools he had worked at, the lawsuit claims. He spent time working at Pasadena's Polytechnic School and Calabasas' Viewpoint School. Marlborough officials are accused of ignoring complaints made by other female students during his time working at the school. The former teacher was arrested in February and charged with two counts of oral copulation of a person under 18 and two counts of sexual penetration by a foreign object, all of which allegedly took place during his time at Marlborough. Koetters pleaded not guilty and could face up to five years in prison if he is convicted. The woman who filed the civil lawsuit is the same one mentioned in the criminal case, her attorney David M. Ring told the Los Angeles Times. The lawsuit alleges that when Koetters was in his early-to-mid 30s he took part in a yearlong sexual relationship with a 16-year-old student, which began in the 2000-2001 school year. The lawsuit claims that unnamed teachers and staff members did not stop the relationship or properly discipline Koetters . Koetters also allegedly impregnated the woman, who then had a miscarriage, according to the criminal lawsuit. The alleged victim of both lawsuits spoke to police in July after a different former Marlborough student wrote an online essay accusing the school of not properly acting upon her allegations of Koetters' inappropriate contact with her. Mikaela Gilbert-Lurie's essay, published on xoJane, revealed an inappropriate relationship that Koetters instigated with her in 2011 while she was a 16-year-old junior. In her essay, Gilbert-Lurie said that Koetters crossed the student-teacher boundary when she asked to interview him for the school newspaper. He agreed, replying 'It's a date' to her email. Later when they met up outside the school, she wrote that he dodged her questions and turned the conversation towards romantic poetry, saying he could lend her one of his favorite books. At the end of the conversation, his hands brushed against her knee. Other students, including the one who filed the lawsuit, came forward after Mikaela Gilbert-Lurie (pictured) wrote an online essay about her experiences at Marlborough with Koetters . While Gilbert-Lurie admitted in her essay that the flirting made her feel good at first, she became less comfortable with their relationship when he started getting more explicit in their email conversations. He said he knew how to draw boundaries with other students but not with her and talked about how her short school skirt made her 'so alluring'. A few day later, the teen wrote him saying they needed to stop so she could focus on finals and 'just being 16'. Koetters responded 'Ugh, Ok,' but continued to harass her in class and through email, the teen claimed. With the support of her brother, she decided to tell her parents. In 2011, Gilbert-Lurie and her parents informed the school about Koetters' inappropriate behavior, prompting an investigation. Head teacher, Barbara Wagner, told the family that the complaint would be taken seriously - and was allegedly advised by the president of the board of trustees to handle the matter internally. When asked if there had been previous complaints against Koetters, it appeared that the head teacher failed to mention a similar complaint in 2005. It does not appear that complaint by a female student was credited at the time, according to the magazine. Koetters, who had taught at Marlborough for 14 years, was sent to sexual harassment training following Gilbert-Lurie's complaints and stripped of his position as chair of the English department - but was not fired because it was a 'first-time offense'. Marlborough private school in LA costs $35,000-a-year and attracts female students from some of Los Angeles most prestigious families . Gilbert-Lurie was moved to another English class. Marlborough claimed last year that they were unaware of Gilbert-Lurie's allegation from her xojane essay that Koetters had touched her knee. The University of Pennsylvania student said that the school had been informed. Koetters remained at the school alongside Gilbert-Lurie for another year before starting a new job at the elite Polytechnic School in Pasadena. Marlborough School announced in the fall of 2014 that Wagner would resign by the end of June 2014, after it was revealed that she did not properly respond to students' allegations against Koetters. Marlborough School was not immediately available for comment.
Joseph Koetters has been sued by an unnamed Marlborough student, 30 . Lawsuit alleges that Koetters  took part in a year-long sexual relationship with a 16-year-old student, which began in the 2000-2001 school year . Lawsuit also claims unnamed teachers and school officials are held responsible for not ending the relationship . Woman came forward after another former student wrote an online essay accusing Koetters of acting inappropriately toward her .