Need help with this scripting.

[HoyChampoy]

Hey guys. I am working on a custom story and there is this part where you are in a hallway and a grunt is patrolling it. You have to sneak across him in order to get to the other room. But the thing i want to do is that if the player fails to sneak across the hallway and dies, I want the player respawn and try sneak pass him again. (like a videogames these days. if you die, you start from a checkpoint and you have to do the part again.) I just cant seem to do it. When I die, i do start at the assigned checkpoint, but the script areas no longer work and the grunt doesn't spawn anymore. Is there a way to do it? Please help. Thanks!