The information comes from federal murder charges filed against Keyshawn Willis, Keenan Martin, Jerome Steve and Monte Isaac.
The four are accused of killing Demetrius Sam on Nov. 2 in Neshoba County.
U.S. Magistrate Judge Linda Anderson on Monday ordered authorities to keep all four men in jail.
A sworn statement by an FBI agent says Martin, Steve and Willis confessed to beating Sam. It says Sam was then doused with lighter fluid, set on fire, and placed in a fire pit.
Morrow says Isaac, in a wheelchair, encouraged the assault.
Attorneys for the men didn’t immediately return messages seeking comment.