Conway died at 8:45 a.m.in the Los Angeles area. Conway's wife, Charlene Fusco, and a daughter, Jackie, were at his side.
According to Alz.com, NPH "is a brain disorder in which excess cerebrospinal fluid (CSF) accumulates in the brain's ventricles, causing thinking and reasoning problems, difficulty walking", among other symptoms.
A native of Ohio, Conway credited his Midwestern roots for putting him on the right path to laughs, with his deadpan expression and innocent, simple-minded demeanor.
Conway won three Emmy awards for acting on the Burnett show and a fourth as a writer in the 1960s and '70s.
"We really didn't attack people or politics or religion or whatever". Conway was amusing, so funny that just looking at him would immediately make you smile if not bust a gut.
The show operated with just five writers, one producer, one director and without network interference. The cast included Harvey Korman, Vicki Lawrence and Lyle Waggoner.
"The love he gave us, and the laughter he gave the world will never be replaced, but will be remembered forever", Kelly Conway said in a statement. He also starred in the "Apple Dumpling Gang" movies in the 1970s and made a string of DVDs, starting in the 1980s, as the 4-foot-tall athlete Dorf. (1976), "Cannonball Run II" (1984), "Dear God" (1996) and "Air Bud 2" (1998).
She said Conway would stick with a sketch's script through dress rehearsal but once it was time to tape the performance for a broadcast, he began freelancing.