Star witness against Suge Knight is missing.

Melissa Isaac, the – presumably – ex-girlfriend of Suge Knight has slipped off the radar since her alleged beating at the hands of Knight in Vegas several weeks ago. Isaac was discovered completely nude in the street with the Death Row Records boss still attacking her after allegedly arguing with her as they rode in Knight’s car, police say. Authorities report that this week Isaac, who was to testify against Knight, couldn’t be found at her last known address, and folks at the residence reportedly claim she never lived there. The bad news for Suge, however, is that prosecutors don’t necessarily need Isaac’s testimony to prosecute him for the attack.