Casey Kasem's widow Jean has been cleared in the elder abuse investigation, which has lingered for a year.
TMZ broke the story ... police launched an investigation after Casey's kids filed a report claiming Jean had taken the famous DJ on a wild, multi-state car ride which compromised Casey's health, creating bedsores that became infected.
Casey died last June, and Jean took the body to Norway, where it remained for months. Police wanted it brought back to the U.S. for a complete autopsy but that never happened.
We've just learned the L.A. County D.A. rejected the case, saying Jean did a good job caring for her husband, and concluded, "The development of a bedsore by itself is insufficient evidence of abuse or neglect."