This was an awesome movie!!! I literally watched it two times back to back because I didnโt realize at the very beginning the man on TV running for office was actually the adult son of LeAnn and Bayou, which is why LeAnn couldnโt have the baby at the hospital, she didnโt know if it would be born with darker skin. However, the child was born with very fair skin so he passed for white all his life, and no one ever knew, to include him nor LeAnnโs husband, knew that he was Bayouโs son.
The old lady walking on the railroad tracks is Bayouโs mother now older, who knew everything and even delivered the baby. So she took the letters to City Hall to her โgrandsonโ so that heโd finally know the truth. There was no murder to be solved, everyone knew who killed Bayou and why, they were all there. I think Bayouโs mom wanted her grandson to know the truth before she died.