"48 Hours" explores new developments in 1983 Chino Hills killings
New DNA evidence could impact the future of an inmate who has been on death row for more than 35 years. Kevin Cooper was convicted of the 1983 Chino Hills massacre in California that left four people dead and an 8-year-old boy critically injured. Cooper has always maintained his innocence. Erin Moriarty joins "CBS This Morning" to preview her report with new details for Saturday's "48 Hours."