An intriguing and original read
Death Sentences didn't feel predictable or unoriginal once. The imaginative plot is definitely one of the primary strengths of your writing.
Read the story now
However, there are things about the execution of the plot that could be better. I have two main criticisms that you can work on:
1. Your writing style is very confusing at times. There were sentences that I had to read multiple times to fully understand them. I think it's primarily descriptions that you need to work on; I missed patient, simple descriptions of the characters and their surroundings that would allow me to immerse myself more deeply in the story. They were either very simple (like describing four characters based on their hair color alone) or a little over-the-top and confusing (like when you described the blood from the biker in chapter 1).
2. An important thing in any story is sympathetic characters. I feel like your MC is very sympathetic in his internal dialogue, he's an intriguing character who is obviously dealing with some heavy stuff. However, it's a little heavy to go through an entire book with an MC who doesn't seem to like anything. Fx I didn't get the feeling that he likes his friends or his brother from their interactions. That can be fixed by spending more time thinking about what his friends are like, making up backstories for them that don't necessarily need to be told to the reader, but it'll give the feeling that the protagonist knows them because, well, the writer knows them. Even if he doesn't like his friends, maybe an appreciation for nature, literature, etc.?
These two points of criticism are the primary things that I can point at that would make your story better. As I said, the plot is very imaginative and your main character is interesting. Your dialogue and interactions between characters in general feel realistic, and you manage to build suspense through the first few chapters. All in all, a very enjoyable read :-)