sentences:  Mary Jane Leader died March 15, 2011, due to chronic obstructive pulmonary disease.Upon the death of former Delaware governor Elbert Carvel in 2005, Leader became the earliest serving US governor of any state still living until his death in 2013.Leader died on May 9, 2013, in Hershey, Pennsylvania at the age of 95 at Country Meadows Retirement Community, which he founded.