Cubes, I couldn't confirm Jack passed away. I finally found my CD FAA records on N921JK buried in storage, thought I had lost them. It had John F Kenton as the builder and John F Kenton Jr, "Jack", as the later owner. I used a free search.
http://californiaobits.tributes.com/ Using their advanced search, I was able to pick the state and time frame. It appeared to show John F Kenton Sr passing on April 5, 1991. The Lacey WA address matched the FAA records. It didn't have a listing for Jack. It did allow me to search for any Kenton that passed between 2010 and now. It had 96 listings for all the states, none of them matched. Using street view, I connected Jack to the Altavita Retirement Village here in Riverside CA, using his last FAA address. Found out Westmont Village bought out Altavita Village thru a BK about 2 1/2 years ago. Found phone numbers for both, talked to the same person. Of course, they wouldn't give out any info on Jack, but did say the address in the FAA records is part of their village. Jack's last post was Sun Jul 06, 2014. Called the EAA, a fellow couldn't find anything saying Jack had Gone West, but did imply his membership expired about 2 1/2 years ago, he did like my idea of putting a Gone West tab on the EAA site.
Another opportunity was missed on my part. I should have found him and at least said hello. Would've liked to have flown with him, which would've made his POH crystal clear. Listening to his stories would also have been nice, not just the facts but the adventures. Sounds like you're right on his passing. R.I.P.
Thanks,
Shack
N921JK T-18C Orig Airfoil - Built by John Kenton, his son Jack flew her for about 30 years, I fly her now.
N711RF T-18 - Built by Roy Funk, I flew her about 200 hrs - Sold
Deleted to Edit: Updated info several times.