I live about 30 minutes from Valdosta.  There are lots and lots of rumors going around about this.   Accurate information can be found at the Valdosta Daily Times.

Rev. Floyd Rose, president of the Valdosta Chapter of the Southern Christian Leadership Conference, was close to the Johnson family.  He helped organize rallies; he worked with a businessman who put up $10,000 in reward money (which was returned after no one came forward with information); he put up his personal residence to bond Kendrick Johnson's father out of jail.  These are his exact words: "Finally, without any credible evidence, which has yet to be presented, that Kendrick Johnson was murdered, I would have to believe that the coroner, the district attorney, 6 GBI agents, investigators from the sheriff's office, the medical examiner in Atlanta, and Macon, members of the Georgia Investigation Division, and other school personnel, would have to be part of a massive cover-up, that someone, yet unknown, would have hatched, for reasons we don't know, at a time not yet determined."

Many people of Rev. Rose's stature in this area believe that it was accidental and find it hard to believe that dozens and dozens of people, including high school students, are involved in some massive conspiracy to cover this up.  I honestly don't know but I lean in the same direction.