As John Marvin Murdaugh cleaned his nephew’s blood and brains off a feed room floor on June 8, 2021, he made a silent vow. “In my mind, I told Paul I loved him,” he tearfully testified to a Colleton County jury on Feb. 27. “I promised him that I’d find out who did this to him.” “Have you found out?” asked Jim Griffin, a defense attorney representing John Marvin’s brother, Alex Murdaugh. “I have not,” John Marvin replied.