The documentary Last Supper (IMDb / full video on Vimeo) by Mats Bigert, and Lars Bergstrom released in 2005 suggests that there is a connection between the declination of a last meal and whether or not a person’s guilt has been posthumously disputed and challenged. Are there evidence backing up this claim?
I am aware of Kniffin, Kevin M., and Brian Wansink. "Death Row Confessions and the Last Meal Test of Innocence." Laws 3.1 (2013): 1-11, but they focus on self-perceived innocence.