Katya Petrova, played by Beata Pozniak, was a recurring character seen on Melrose Place, the second series of the Beverly Hills, 90210 continuity. She appeared in season 2.
Katya was an intern at Wilshire Memorial Hospital who struck up a friendship with Matt Fielding. She was from Russia and got Matt to marry her in order for her to stay in the country.
She later had a hand in saving the life of Michael Mancini after he and Kimberly Shaw got into a car accident.
Katya was later called back to Russia for an emergency, but never returned after deciding to stay there.