HOUSTON --Police are investigating a man's mysterious death in southwest Houston. The man was found dead in the front passenger seat of a vehicle parked at a busy gas station on San Felipe and Fountainview on Monday morning. While investigators are still trying to figure out how he died, they say they do not expect foul play. The identity of the 41-year-old victim and his cause of death will be determined by the Harris County Institute of Forensic Sciences. Police say the investigation is continuing.