Ann Arbor police continue to investigate the crash that killed Sharita Williams in early August.Melanie Maxwell | AnnArbor.com Ann Arbor police continue to investigate the crash that killed Sharita Williams in early August and work could continue for weeks. Officer Jamie Adkins, the lead investigator on the case, said more investigation has to be done before the case can be turned over to the Washtenaw County Prosecutor’s Office for potential charges.