Pinging you to post number 15,247. Sounds like a job for you!
I need more clues - there are a whole bunch of people named that. LOL, I cross-referenced one who has lived in all the same places as the players - Encino, Sherman Oaks, Van Nuys, Studio City, W Hollywood, N Hollywood, Santa Monica. Too funny.
Problem is, that isn't a real person, in all likelihood. ANS used Michelle Chase so much that "she" shows up in databases, with no other known info, lol.
I did a search on Rte66's list for Alex Katz. It isn't there . . . yet.
Since ANS was painting it could be this Alex Katz:
http://www.cbsnews.com/stories/2007/02/11/sunday/main2458398.shtml