( CNN ) This week brought a dramatic turn of events in a small community outside of Detroit : A man bloodied during a traffic stop was cleared of all charges , the police officer who arrested the motorist is charged with beating him and the community 's police chief has stepped down . On Monday , Wayne County Prosecutor Kym Worthy announced charges of assault and mistreatment of a prisoner against William Melendez . He 's the 49-year-old former Inkster , Michigan , police officer who is seen in police car dashcam video grabbing the unarmed motorist , Floyd Dent , around the neck while he lay on the ground and punching him several times in the head . `` The alleged police brutality in this case can not and will not be tolerated , '' Worthy said . On Wednesday , drug charges against Dent , 57 , were formally dropped in Michigan Circuit Court , clearing the motorist of all wrongdoing . `` He busted out crying and was very emotional , '' said Angela Martin , the assistant to Dent 's attorney . In the wake of the reversal of fates , Police Chief Vicki Yost announced Wednesday her resignation , according to Inkster City Manager Richard Marsh . Marsh would not cite a specific reason for Yost 's investigation , though she had been the face of the Police Department during the investigation into her former officer . In a statement , Dent and his attorney Greg Rohl told CNN : `` We are all ecstatic , especially Mr. Dent . This is another step in the right direction . The system is still working , and we are very hopeful the prosecutor 's net will catch even more fish in the near future . '' Yost did not respond to a request for comment . Dent , a veteran Ford automotive worker , was arrested after the January traffic stop on charges of drug possession , assaulting an officer and resisting arrest . With the court decision Wednesday , all charges from the arrest have been dropped . Melendez pleaded not guilty to the new charges brought against him in an arraignment Tuesday at Inkster District Court , according to his lawyer , David Lee . `` We intend to vigorously contest the charges , '' Lee said . `` I can understand how people might be disturbed by looking at [ the video ] ; however ; I hope everyone will withhold judgment until all the facts come out where they should in a court of law . '' Worthy 's announcement came after the conclusion of two investigations into the incident by Michigan State Police and the Wayne County Prosecutor 's Office . In the police report written after the January arrest , Melendez wrote that he hit Dent only after Dent had threatened him and bit him in the arm . Melendez wrote that as he approached the car , Dent kept his hands from view , looked at him `` with a blank stare as if on a form of narcotic , '' and said , `` I 'll kill you . '' Dent told CNN at the time that he had never threatened nor bit the police officer . `` I did n't bite anyone . I did n't have time to bite anyone . He was too busy pounding me in my head , '' Dent said . Rohl also alleged that the cocaine found at the scene had been planted by Melendez . `` My client 's fingerprints will not be on that bag , '' Rohl told WDIV .
Inkster , Michigan , Police Chief William Melendez resigns in the wake of charges against one of her former officers . Vicki Yost was caught on police car dashcam video in January beating an unarmed black motorist . Melendez was charged with assault on Monday ; all charges against the motorist have been dropped .