I've submitted Nicholas Walter Vandekamp's case, and this case to NamUs, and each agency involved.
While trying to solve an unrelated unidentified person’s case, I was looking through missing persons when I saw a familiar face I had seen before. Then it struck me: it's "Steve Hex," the name given to an unidentified man who suffered a severe brain injury after being hit by a drunk driver in 1998, and who later died in 2002. Later, I discovered that their NamUs profiles were perfectly identical, aside from Vandekamp being listed as having brown hair and the unidentified listed as having auburn hair (reddish brown hair).
TIMELINE
On March 28th, 1982, Nicholas Walter Vandekamp went missing after visiting family in Whidbey Island, WA. "His wallet was later recovered in Linn County, OR and his vehicle was located in Patterson, CA." Then on December 12th, 1998, a man was hit by a drunk driver in Forrest County, MS. "The victim told responding paramedics that his name was Steve Hex (Hicks) and that he was from West Virginia."
SIDE-BY-SIDE
If Mr. Vandekamp is indeed this unidentified, I suspect for whatever reason, that he had abandoned his life for a new life (transient?). This would mean that the unidentified was ~47 years old by the time he was struck by the driver. His NamUs profile states that his age range couldn't be determined but for some reason, an Unidentified Wiki on Fandom.com has his age at 22-28. Although, I do agree that the UID appears younger than 47, and this will certainly be hard for most to consider.
Looking at their side-by-side, you can see a similar hairline, brow/eyebrows, nose, and facial structure, and if you can imagine the unidentified's facial expression wasn't so contorted, you can find Mr. Vandekamp.
Nicholas Walter Vandekamp (NamUs MP40957)
The National Missing and Unidentified Persons System (NamUs)
Forrest County, MS Unidentified (NamUs UP4746)
The National Missing and Unidentified Persons System (NamUs)