A few specific things which I remember about the first trial, which hopefully we can get JT's opinion on, and also from subsequent trials while Skeen was in office:
Police detective Doug Collard testified that he "aged" Cooks fingerprints and that they were left at the exact time of the murder. Testimony that it is impossible to "age" a fingerprint was not allowed into evidence.
Despite Cook's lawyer's request for him to be in solitary confinement at the Smith County Jail, the sherriff put him in a cell adjacent to Shyster Jackson, who testified that Cook confessed to the murder. During testimony, Michael Thompson asked Jackson if he had received a reduced sentence in exchange for his testimony. Jackson said no, which I guess was true. However, weeks later Jackson's charges were dropped and he was released from jail and recanted his testimony. He said AD Clark had shown him crime scene pictures and coached him on what to say.
During Cook's third trial, prosecuted by Dobbs and Skeen, a critical piece of evidence literally fell out of the victim's pants leg while jurors were examining it. Michael Thompson had contended that Cook kept the missing stocking as a souvenir, and that he was a violent sexual predator. That evidence was clearly suppressed by AD Clark, and it seems it was also suppressed by Skeen.
There are numerous other instances of prosecturial misconduct, both by Clark and Skeen.