No obituary is found for Dennis but I found the below. He was very proud of his profession (dentistry) and his family business (strawberry farm) in Highland.

Some quotes below:

(Dave Nordquist)
In 1952, Ruth and Ronald Hamamura, and children Dennis, Roger, and Roy, arrived
from Honolulu, Hawaii, and purchased their East Third Street property.
They built a large glass green house for an exotic plant nursery. A
disastrous freeze that winter killed most of their unprotected stock.
Ronald went to work for Sears for fifteen years. The Hamamura’s had 10
acres, but no water, so they leased 15 acres from the Rozemas, their
neighbors to the west. In 1960, the Hamamuras sank a well on their own
ten acres and have since become outstanding strawberry producers in the
area. Also grown are Maui style onions and vegetables.
From Highland Historical Society

See: https://www.facebook.com/groups/2503903462984985/posts/24534161612865854/

See Image for more history