Allyson Russo, an ADA, is another of those characters who, when they appear, seem like they might remain on the team's (and show's) radar, but it doesn't quite pan out. She is the biological daughter of crime boss Whitey Doyle, though she has buried this fact and rejected all overtures from him. She has serious doubts about Guerrero from the moment they meet, and these are not helped by his willingness to perform impromptu surgery in the back of the car to extract the tracking device she has swallowed.

Allyson, like a number of other characters, is set up for a return which never occurs.

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