LOS ANGELES (CBSLA.com) — A former English teacher at an elite private girl’s school faces new charges of having a sexual relationship with a second female student, Los Angeles County District Attorney’s officials announced Monday.

Joseph Koetters, 47, of Santa Monica, pleaded not guilty to 10 new charges and was released Monday after posting an additional $350,000 bail. Koetters, who was originally charged with four counts, now faces seven counts each of oral copulation of a person under 18 and sexual penetration by a foreign object of a person under 18. His next court appearance is scheduled for June 23.

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Koetters taught English at the Marlborough School in Hancock Park when prosecutors say he initiated a year-long sexual relationship with a 16-year-old female student in 2000.

According to the District Attorney’s Office, a second victim recently reported having a sexual relationship with the former teacher between February and June 2004 when she was also a 16-year-old student.

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When Koetters was first charged, police said they interviewed two more victims, but one of the incidents occurred too long ago to file charges, and the other happened in Nevada.

Koetters taught at Marlborough for 14 years, then went on to teach at Polytechnic School of Pasadena.

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If convicted as charged, Koetters faces more than 11 years in state prison.