I just watched the docudrama Manson a few weeks ago. It is narrated by Linda Kasabian who was present during the murders but was never convicted. She did how ever serve as the main witness for the prosecution. The film makers had to search for Kasabian and convince her to tell her story. It is only the second time she has spoken about the incident in 40 years.
http://www.guardian.co.uk/world/2009...abian-polanski