I just did a google search and came up with a name: Michael Brescia,the son of William Brescia, a fireman in Philadelphia. Some suspected at one point that he was John Doe #2. It's been so long since I looked into these details that I don't remember more. Since I live in the Philadelphia area, I remembered him because of the local connection.
Weird! I wonder what made them think he was John Doe #2? I hadn't heard anything about him before.