the announcement last week. Now, her sister, nicole, is speaking out. Abc's dan harris has the story. What's happening here? I'm saying my prayers. Reporter: Leah remini, former star of the hit cbs... See More
the announcement last week. Now, her sister, nicole, is speaking out. Abc's dan harris has the story. What's happening here? I'm saying my prayers. Reporter: Leah remini, former star of the hit cbs sitcom "king of queens" was a famous and outspokenly proud member of scientology. When she dropped out, it made headlines. Since the news broke last week, remini has not explained why she left. Only issuing a statement, expressing her sincere and heartfelt appreciation for the support she has received. Now, remini's sister, nicole, who left the church herself several years ago, is coming forward, giving interviews to "people" magazine and a local radio station in minnesota. We have been involved in scientology for 30, 35 years of our life. You can imagine the circle of friends that my mother has. My sister has. They literally have pulled in these people and told them they had to choose between relationships with my sister and my mother and the church. And I'm going to tell you, these people chose the church. Reporter: Her relationship with the church began to sour in 2006, at the wedding of tom cruise and katie holmes. Where leah remini reportedly asked the head of the church, david miscavige, who was tom cruise's best man, where his wife was. His wife has not been seen publicly for many years. She was shocked. She did not at all expect that type of response. And then, it just kind of escalated from there. According to leah's sister, when leah asked if she could call shelly miscavige, she was asked to write a letter and the church would hand it to her. The church claims that shelly miscavige is a private person and does not like to be seen in public. Reporter: The church has publicly denied the story about remini confronting david miscavige at tom cruise's wedding. The church has also denied that members are forced to cut themselves off from former church members, saying the decisions are voluntary. The church released a statement to abc news overnight saying, mrs. Miscavige continues her work in the church, as she always has. Leaving the church has been a huge life-changer for leah remini. She's been a member since age 9. Even serving for a year, according to her sister, in the church's elite religious order. But this morning, her sister tells abc news, leah is holding up well, with the support of her family. For "good morning america," dan harris, abc news, new york.
This transcript has been automatically generated and may not be 100% accurate.