(CAMERON)   Cameron Police are investigating the Sexual assault and robbery of a 90-year old Cameron  woman.  The incident was reported to police shortly before 8 last (Monday) night at the woman’s residence near downtown.  Cameron Police Chief Leonard Doskicil said a Texas Ranger is assisting in the investigation.  Doskicil said he wanted the public to be aware that such a crime can happen here in Cameron.   Being aware that these crimes can happen may help prevent such an act in the future.