An attorney for Nolan Xavier Wells’ family says he will release the results of an independent autopsy into the 18-year-old’s death Wednesday morning.

Preliminary findings will be made public during a news conference held at the NAACP’s annual National Convention in Chicago, according to civil rights attorney Ben Crump, who represents the family. Wells’ parents are expected to attend.

Crump has vowed to conduct his own investigation into the circumstances of the teen’s disappearance, which occurred after a July 4 boat trip with friends to an island off the coast of Mississippi. Wells did not return to the mainland with his friends. His body was found floating off the island’s coast two days later.

The Mississippi State Medical Examiner’s Office performed its own autopsy but has not yet released the results.

The second autopsy was arranged by the family and Crump, and paid for by former NFL player Colin Kaepernick. Crump said he would determine whether Wells “had any physical injuries to his body beyond drowning.”

The still-unknown circumstances surrounding Wells’ death have sparked rampant online speculation and prompted calls from black leaders for local authorities to be transparent. Wells, who was black, had traveled to the island with a group of high school friends, all of whom were white.

A $125,000 reward, jointly funded by the Rev. Al Sharpton, actor-producer Tyler Perry and former NFL player Terrell Owens, is now being offered for information leading to an arrest and conviction in connection with the death.

The autopsy announcement comes two days after Wells was buried in his hometown of Ocean Springs, Mississippi.

In his eulogy, Sharpton lamented the “inconsistencies and unanswered questions” that had placed a dark cloud over the grieving family.

He questioned why Wells’ friends had left him behind, taken his phone and keys and not reported him missing to the police. And he suggested that local investigators had spoken prematurely in statements to the press indicating that no crime was suspected.

“The reason a lot of people across the country are looking at the Nolan situation is because we’re looking at Mississippi history,” Sharpton added. “We can’t have someone in law enforcement say there was no crime before there was an investigation.”

Jackson County Sheriff John Ledbetter said initial interviews suggested Wells decided to stay on the island and that his friends believed he would be taken to someone else. He said the friends were cooperating with the investigation, which is ongoing.

“We’re trying to be respectful and collaborative as much as we can,” Crump said. “But it’s always problematic for all of us when these investigations take forever.”