How was DNA evidence used to prove that Dr Sam Sheppard did not murder his wife?

DNA evidence played a crucial role in the exoneration of Dr. Sam Sheppard, who was convicted in 1954 for the murder of his wife, Marilyn. In 2000, DNA testing on evidence from the crime scene, including blood samples, indicated that the blood did not match Sheppard's, suggesting that another individual was responsible for the crime. This scientific analysis contributed to the re-evaluation of his case, leading to a posthumous declaration of his innocence. The advancements in DNA technology highlighted flaws in the original investigation and trial.