Story highlights Inkster, Michigan, Police Chief Vicki Yost resigns in the wake of charges against one of her former officers

William Melendez 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

(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 cannot 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.

JUST WATCHED Shocking video shows police hitting man Replay More Videos ... MUST WATCH Shocking video shows police hitting man 03:43

"He busted out crying and was very emotional," said Angela Martin, the assistant to Dent's attorney.

Read More