Police have arrested a fifth person in the beating of a motorist who stopped to help a 10-year-old Detroit boy struck by his pickup truck.

Officer Dan Donakowski says the arrest was made Wednesday. Police have not released the person's name, age or any other details.

Arraignments were Tuesday for 17-year-old Bruce Wimbush Jr., 30-year-old Wonzey Saffold and 24-year-old James Davis. They're charged with assault with intent to murder and assault with intent to commit great bodily harm.

A 16-year-old boy also faces a hearing Saturday.

Steve Utash is hospitalized with head injuries. At least six people punched and kicked him April 2, when the 54-year-old tree trimmer from Clinton Township stopped to check on David Harris after the boy stepped in front of his truck.