A Detroit-area artist whose studio was where the parents of the Oxford High School student charged in a deadly shooting were found by police is cooperating with authorities and didn’t know the couple had stayed overnight, his attorney said Sunday. James and Jennifer Crumbley, who face involuntary manslaughter counts, were found early Saturday inside a Detroit commercial building. The couple’s attorneys have said they didn’t intend to flee, countering authorities who accused them of eluding capture for their alleged role in a school shooting that left four students dead. Their 15-year-old son, Ethan Crumbley, has been charged as an adult with murder, terrorism and other crimes. The couple went to…