The Betty Lloyd that died in Toledo in 2002 was the widow of Walter.
If William was born in North Carolina, there is one possible William Lloyd in the 1940 Detroit census. He was the 27 year old single son of M. W. and Mildred.
Obits from the Detroit Library are $25 per http://www.detroitpubliclibrary.org/sites/default/files/Obit...
If Betty was about the same age as William she would be about 100 years old now and likely deceased. Too bad you didn't write Betty more often than every 10 years.