Actually, there have been a number General Authorities that have been excommunicated over the decades. Of the original 12 apostles called in this dispensation, 10 experienced some level of apostasy. Of these some were out side the Church for just a few weeks before repenting, some were out for years, and some never returned. At the time of Wilford Woodruff, at least one Apostle lost his seat in the Quorum of the Twelve because he refused to accept the end of the practice of polygamy. (I can't remember if he was actually excommunicated over this.) However, I think that the man to which the questioner is referring is George P. Lee. In 1975 Lee was ordained a member of the Quorum of the Seventy. In 1989 he was excommunicated for “apostasy and other conduct unbecoming a member of the church.” Just what this involved, we can't be sure. It is the Church's policy to respect the privacy of people against whom it takes such actions. Therefore, the Church does not comment on the specifics that lead to excommunication. Lee claimed that his excommunication was the result of a difference in opinion about the way the Church dealt with American Indians. Because of the Church's policy, any assertions of other reason for his excommunication are pure speculations in the absence of evidence. I am sure that the reason the person asked the question is in an attempt to connect Lee's later guilty plea to charges of attempted sexual abuse of a child (a twelve-year-old girl) to his excommunication. However, there is no evidence that the Church was aware of this attempted abuse.