Mark's case was shown in a short clip on Nancy Grace, America's Missing.
http://cnn.com/video/?/video/crime/2011/01/28/ng.america.missing.two.hln
http://cnn.com/video/?/video/crime/2011/01/28/ng.america.missing.two.hln
I have access to an online newspaper archive database through my college. There are over 100 articles about Mark's case so I thought I would post things I found out that haven't been discussed in this thread yet.
1.) The brush fire was on Bayshore Road.
2.) A custodian (another article said he was a ranger) at Cape May County Park South reported seeing Mark with a young girl sometime between 3:30-4:00 (Different articles give different times)
3.) Mark's sneaker was found 75 yards from his house
4.) Mark lived at Sun Ray (Beach) Road.
5.) A girl who lived on the same street as Mark, and was friends with him, was locked in a dirty closet for hours every night by her grandmother. LE was looking for a possible connection between the two cases (1993).
6.) A sketch of Mark's abductor (according to LE) showed a man in his 20's with dark, greasy hair, and wide-rimmed glasses. He was believed to be a Philly resident, and was driving a white compact car. In the sketch, he was wearing a plaid shirt. Witnesses described seeing this man talking to Mark (1993).
7.) Before he went to see the brush fire, Mark told his mom that was excited about a visit he was going to make that evening to the home of one of his teachers. He had a crush on the teacher's daughter.
Here's an archived version of a website Mark's parent set up for him: http://web.archive.org/web/20050410074133/http://www.markhimebaugh.com/
Thanks for posting these bits of info. The little girl who was locked in the closet-do you know if charges were brought against the grandmother? Do you know if there was ever any explanation given as to why the little girl was locked in the closet? How did the witnesses know the man was from Philly? I wonder if anyone noted his lic plate number?
Could Mark Joseph Himebaugh who went missing from Del Haven NJ be Grateful Dead Fan?
Here is his thread
NJ NJ - Mark Joseph Himebaugh, 11, Del Haven, 25 Nov 1991 - Websleuths Crime Sleuthing Community
Charley Project
http://www.charleyproject.org/cases/h/himebaugh_mark.html
Perhaps the child's family didn't want to get her involved in a police investigation. Or maybe she was frightened by all the talk about the case around town, and didn't tell anyone of her part in the story.
I'm guessing Mark lost his shoe in a struggle.