Big Boned by Meg Cabot
Heather seems to have an uncomfortable propensity for discovering dead bodies, and it happens yet again when she enters her new boss's office to find him face down on his desk with a bullet hole in his head.
One of the students is arrested for the murder, and Heather is prevailed upon by his girlfriend to investigate. Heather doesn't want to, but finds herself doing so anyway, when one of the residents of her dorm is arrested while trying to solve the mystery on his own.
Cabot's protagonist has been compared to the Janet Evanovich's Stephanie Plum, but I find Heather easier to identify with, but that may just be the academic environment, something I'm quite familiar with.
In any case, if you like the Stephanie Plum books, you'll probably enjoy these.