A southern California police officer is under investigation after he was accused of raping a transgender woman while on duty.

The El Monte officer was placed on leave while he’s investigated for allegedly attacking the woman as she walked to a friend’s house between 4 and 6 a.m. Oct. 23, 2012.

According to the complaint, the officer pulled up and ordered the victim to lean into the driver’s side window of his patrol car and demanded to know what she was doing.

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She said the officer groped her and asked if she was “a nasty shemale,” and the woman told him she was transgender.

The officer then led the alleged victim to a secluded area nearby and ordered her to perform oral sex and then raped her, the complaint says.

The alleged victim turned over a condom she says the officer used during the attack to investigators.

She went to a hospital after the alleged assault and the case was turned over to the Los Angeles County sheriff’s department.

Her lawyer said the alleged victim complied with the officer’s demands out of fear, and he said the police officer had no probable cause to detain the alleged victim.

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Police Chief Steve Schuster said the allegations were “very disturbing” and do not represent expectations set for the department’s officers.

The alleged victim filed a federal civil rights and assault lawsuit Oct. 18 seeking unspecified damages from the police department and the officer, who has not been arrested.

[Policeman getting out from car on Shutterstock]