What if Mr. Zipp was the shooter? He did know all of the passowords. And he knew we would be watching and waiting...
He could have been angry that we didnt figure out all the puzzles. Maybe the deadline was on his kid, and we were unable to help save the kid so he wanted to get back at Maddy.
There are two things that I am wondering about at the moment.
1. Some people mentioned that they could have staged their own deaths. But as far as I know there was only one group trying to kill them and if they staged their own death, the group trying to kill them would certainly know that they are ...