Eric Clark, 45, surrendered to authorities on Friday and has been charged with murder, according to the Jackson police department (JPD). Mr Clark is scheduled to appear in court on Monday.
Police disclosed on Friday that an autopsy investigation concluded "the scene and the hanging were staged". Investigators believe Ms Fortune was killed elsewhere before her body was placed in a hanging position.
Mr Clark's arrest follows the earlier charges of murder against Earnest Lloyd Jr and Jarques Ratliff in connection with Ms Fortune's death. Ms Fortune, a mother of four, was discovered on 3 August hanging from a tree.
The JPD's robbery-homicide division stated it will continue its investigation until all individuals believed to be involved are held accountable.