Tal Karus

 was a crewmember on the Lorelei. He was a tech op, and was murdered by a Voc Robot. He got on very well with Liv Chenka. The Seventh Doctor saw him just before the murder. He had his room recorded. He knew of the accident on Storm Mine 4 and told Cravnet about it. He worked for the Kaldor City company(AUDIO: Robophobia)