williams but three other analysts including greg hampekian said the evidence is enough to rule him out. this knife was handled rigorously. it was rubbed, and friction is what transfers dna. so whoever handled this knife likely left dna. it is not march lel succeellus . reporter: the state supreme court disagreed, allowing the execution to ag ahead. now at the 11th hour an appeal to the u.s. supreme court. josh holly said based on the another non-dna evidence in this case our office is confident in marcellus williams guilt. as he waits for a decision the younger williams says his father is at peace with whatever comes next. i mean if tomorrow is his last day i ll be with him and watch, to be there for him and support him in his last time, his last hour. reporter: the supreme court is expected to have a decision