What murder-mystery T.V. show is this (NOT Harper's Island)?

It started in the early-mid 2000's, and it only lasted a few episodes at most. It was about a small town (I'm pretty sure it was an Island) where serial killings were happening. It was centered around a guy in his early twenties (I think he was a teacher), and a girl of the same age. They had gone to high school together, which was located in this town. There was a sheriff, who was portrayed as the "good guy", although I thought otherwise. There was also the "town bad boy", who everyone suspected was responsible. In the second or third episode, the guy (the main character) invites the girl he went to high school with to a carnival fundraiser (as stated, I think he was a teacher, and I think the fundraiser was for the school). The killer was hiding in the fun-house, and he/she killed a few people. While the main guy was talking to an older man (he was a cop) about the murders, the girl ventured into the fun-house. The girl gets taken hostage by the killer, and the guy realizes she's gone (I think), and goes to look for her with the sheriff and the cop. He finds her, with the killer, in the fun-house, and scares the killer off, but not before shooting the sheriff in the leg. I think it ends like that, and the previews for the following week were about the sheriff spying on the "bad guy" at his house (the house was gray brick, almost like a castle texture). That's all I remember, any help?