The first article appeared in the US Coast Guard Bulletin for 1946.

The article attached below gives different information and puts the crash in 1946.

He is buried in Arlington National Cemetery as you can see by following the link below.
https://www.findagrave.com/memorial/49239130/wilfred-ulrich-johnson

Memorial to those lost in the plane crash on Mt. Tom on July 9, 1946.

1940 Bloomfield, NJ, High School year book for Wilfred "Pete" Johnson.