TRUE CRIME ROUNDUP: Cases that haunt us

This Halloween weekend, we’re focusing on cases that haunt us. These include unsolved crimes that sleuths are still investigating and atrocious acts that leave their imprint on the places where they were committed: the Black Dahlia murder in Los Angeles, the disappearance of University of Minnesota student Mike Olson in Florida, the horrors of Pennhurst asylum and the haunting of Detroit’s Cadieux Café.