One woman, a supposed confidential informant in three homicides, told police that a detective forged her signature when filling out receipts for money — money she never got.

The allegation is one of several startling revelations in a series of previously sealed arrest warrants in the case of ex-Detective Clarence Willoughby (pictured).

Willoughby, a 24-year veteran of the force, resigned shortly before turning himself over to police on Feb. 6 on larceny and forgery charges. He is accused of pocketing thousands of dollars in informant money in four incidents spanning from 2003 to 2007; he has pleaded not guilty and retained defense attorney Norm Pattis.

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