Please help me to find this movie
A bunch of teenagers go to an island to party. Three of them (a boy and two girls) go into a cave to smoke, and one of girls finds other two peoples dead bodies. Then she runs away to warn the others but she also gets killed.
SPOILER ALERT
There is a policeman with them, and he is the murderer. He writes his next victim’s name on whiteboard in the bar.
Club Dread (2004)?
https://www.imdb.com/title/tt0331953/