The feds are lining up star witnesses in their sex-for-overtime case against ex-NYPD boss Jeffrey Maddrey — including a female detective he allegedly slept with and a cop who may have removed K-Y jelly and other evidence from his office, a source told The Post.

A third, unidentified woman is believed to be another key witness against the disgraced police chief.

Top of the feds’ list is Detective Ada Reyes, who allegedly had an affair with the married Maddrey. At the time he was the NYPD’s highest uniformed officer, until he was booted in December following The Post’s exclusive expose on another underling, Lt. Quathisha Epps, who claimed Maddrey coerced her into having sex with him for years.

The Manhattan U.S. Attorney launched its probe after Epps — who resigned — shortly after she fil

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