In what order did the I Love Lucy Characters Die?

Here is the order in which the main cast members of "I Love Lucy" passed away:

1. Vivian Vance (Ethel Mertz): Died on June 17, 1979, at the age of 69.

2. William Frawley (Fred Mertz): Died on March 3, 1966, at the age of 79.

3. Lucille Ball (Lucy Ricardo): Died on April 26, 1989, at the age of 77.

4. Desi Arnaz (Ricky Ricardo): Died on December 2, 1986, at the age of 67.