If the basketball player had actually had criminal charges against him for sexual assault at his old school, i'd think you could make a case for criminal negligence in offering him a free place to stay on campus.
However, this highlights an issue with universities taking it upon themselves to interject themselves into cases of sexual assault amongst its students. When they take university action in lieu of legal action, they may appear to be being proactive on the mater but they are actually preventing it in some cases (some schools take action and report it) from following good due process.
Also, the de facto view on campus sexual assaults in many cases can take a guilty-until-proven-innocent proceeding since you aren't going through the well established steps of due process. Thus allowing a potentially guilty person to simply plead that they were unfairly targeted by some sort of kangaroo court.
I dunno, its early and it looks like I wrote a bunch of stuff... it doesn't look like there'd be a strong case for negligence here.
