Who was Billy's roommate on "Melrose Place"?

Alison Parker was Billy Campbell's roommate on "Melrose Place." In the show's pilot, aspiring writer Billy moves into Alison's apartment after her previous roommate leaves unexpectedly, establishing the living arrangement that drives much of the early series.

Alison, played by Courtney Thorne-Smith, works in advertising and is one of the show's central characters. Billy, portrayed by Andrew Shue, arrives as a struggling writer trying to make a new life in Los Angeles. Although they begin as housemates and friends, their relationship becomes romantic and repeatedly complicated by jealousy, breakups, and other relationships.

A common mix-up is remembering Alison as Billy's girlfriend rather than his roommate. Both descriptions become true during the series, but the question refers to the original domestic setup. "Melrose Place" premiered in 1992 as a spin-off of "Beverly Hills, 90210" and followed young adults living in a West Hollywood apartment complex.