|Sgt. Cathy Tierny|
|First Appearance||"The Beard"|
|Portrayed By||Katherine LaNasa|
Sergeant Cathy Tierny is a woman whom Jerry dates in "The Beard"; she is a police sergeant. Jerry first meets her at a police station when Kramer and George are speaking with a sketch artist. Jerry goes on a date with Cathy (she does not bring her gun) and soon after she asks Jerry a question about the television drama Melrose Place, which he claims to have never watched. Cathy does not believe him and thinks he watches it, so she plans to hook him up to a lie detector test to see if he has seen it or not. Soon after, Jerry admits to Elaine that he in fact does watch Melrose Place (he is a huge fan, as a matter of fact) and he knows that the needle will be going wild when he takes the test. During the lie detector test, Jerry lies when he is asked questions about Melrose Place by saying he does not know any of the answers, when the polygraph indicates that he in fact does know each and every answer. It ends with Jerry angrily answering the last question and storming out of the station, which leads Cathy to shake her head in shame; this would appear to be the end of hers and Jerry's relationship. Sgt. Cathy Tierny was portrayed by Katherine LaNasa.