Dr. Jack Kevorkian, who defied euthanasia laws and agreed in 1998 to be shown on CBS's 60 Minutes administering a lethal injection to a terminally ill man, will be released from a Michigan prison today (Friday) after serving eight years of a 10-25-year sentence in connection with the death of the man, authorities said Thursday. Kevorkian, 79, who is said to be gravely ill himself, has promised not to help anyone else commit suicide following his release. However, he said that he plans to remain an advocate for the right to assisted suicide, and, in that regard, plans to return to 60 Minutes on Sunday for an interview with Mike Wallace, who interviewed him for the feature that resulted in his murder conviction. Sunday's program, which also features a Wallace interview with actress Vanessa Redgrave and a repeat of an interview with Iran's president, Mahmoud Ahmandinejad, is expected to close with a tribute to Wallace by colleague Andy Rooney.