Thank you all for your suggestions. I checked the Casey collection already but didn't find the family I was seeking, perhaps because the deaths followed the publication of O'Kief or perhaps because no stone was ever erected. However, if the person who is collecting the Lucey family information lives close to Ballyvourney, he might know of a Dineen plot. At this point, I'm guessing that Timothy probably died by 1955 because Jeremiah bought the land from Thomas O'Donghue in that year.
I have the Dineen generations traced back to Timothy's grandfather, all of Knocknabro, so I don't think that other townlands will connect.
Thanks again. I'll post if anything concrete comes up.