Released without charge ????

1. Intentional Murder
2. Shot from a moving vehicle
3. Tourist
4. Arrest Made, and Released without charge
5. No comment that they are still looking for the shooter.

I've been ignoring the case (as much as possible) because there are so many possible explanations for what happens when a person gets shot in a rural area. I wanted the police to finish their investigation so I could get the complete story with one reading. "Released without charge" says "unintentional discharge" to me, so I figured it was time to start reading... This is an intentional murder, but they release their first suspect, but they don't say he was innocent.

WTF is going on with this case?