Tex Murphy: Martian Memorandum (1991)

The year is 2033. Your name is Tex Murphy, Private Investigator in San Francisco. You've been hired by the beautiful daughter of a university professor to uncover the facts about his death. Beginning your investigation you uncover the deaths of several prominent members of the scientific community. Are these deaths coincidental or is there something more sinister going on? And when you'll end this case, you will have a chance to try yourself in the next one, this time on... Mars!