West Covina police have opened an investigation into one of their own after the victim of an alleged rape accused a sergeant assigned to sexual crimes investigations of propositioning her.

In a related, but separate investigation, officials said Thursday the Los Angeles County Sheriff’s Department will probe allegations of misconduct against Baldwin Park police Chief Lili Hadsell, per her request.

A 49-year-old woman told West Covina police investigators Monday that a sergeant propositioned and sexually harassed her during and after a rape investigation he conducted.

The woman alleges she was raped by her estranged husband, a prominent San Gabriel doctor who is Hadsell’s brother. Her estranged husband did not return phone calls seeking comment.

“I was raped, going through a nasty divorce and then they stick me with this cop,” the woman said in an interview. “He harassed me through the whole investigation. I was scared. I’m still scared.

“Who do you trust?” she said.

The sergeant under investigation did not return calls seeking comment.

West Covina police Chief Frank Wills said his department will investigate the woman’s claims. He added the law limits what he can say about police personnel matters.

“The department is aware of the allegations and is taking appropriate steps to look into those allegations,” Wills said.