When did Michael Landon die ,and is Karen Grassle ,who played his wife in Little House On The Prairie , still alive please ?

Michael Landon died on 1 July 1991 from pancreatic cancer. Karen Grassle was born 5 February 1942, and is still alive.
Updated on Friday, February 03 2012 at 11:20PM GMT
Source: uk.imdb.com/...
Collections: michael landonprairielittle house1942february 5