Thanks to DarkUFO reader Tony for sending us this very spoilery set report and photos. These we will be behind an are you sure button for those that don't want to know.
This is a definite BOMBSHELL. I just got back from vacation in honolulu.. I saw them shooting a scene for (confirmed by crew member) the season 5 finale on Kalakaua Ave. Mark Pellegrino was reading a book on a bench outside a building when BAM!! Locke falls eight stories out of the window and lands behind him. While people cry out for help and to call 911, Pellegrino (Young Jacob?!) calmly puts a bookmark in his book and casually walks over to Locke's body in the grass and kneels down next to him. I wasn't sure who the guy was on the bench but after seeing his picture on the site, it was DEFINITELY Pellegrino. Terry O'Quinn was laying on the ground for a good amount of time with bloodied make-up and fake glass on/around him (I even went back and found some fake glass later!) If you're interested, I managed to sneak a few pics too.