Jan Chorlton was a promising television reporter working with CNN, ABC and CBS News. She was lively and daring, one of those people who celebrated life. But at only 40 years old, the subtle changes of lapses in memory began. Correspondent Barry Petersen reports a personal story of early-onset Alzheimer’s, first broadcast on “Sunday Morning” June 20, 2010. [Jan Chorlton Petersen died on May 11, 2013.]