She was a water merchant and owner of Cassidy Caravans in the Mojave Wasteland in 2281. She was also a possible companion of the Courier.
Fallout: New Vegas
Worn down by years of hard luck and a rash of terrible misfortunes, Cass was a despondent merchant that wanted to get out of the caravan business.
When first encountered by the Courier, Cass was drowning her sorrows at the Mojave Outpost bar.
NCR Ranger reports had reached her that her caravan had been attacked and "burned to ash," placing an even greater burden on her shoulders.
However, threats along the road into New Vegas and problems with NCR paperwork were preventing her from leaving the outpost to investigate the attack.
Her corpse can be found in the Outpost barracks, alongside several other dead NCR troopers. Judging by the lack of body decomposition, it is presumed that she was not immediately killed by the cannibals, but instead kept as "human cattle" and slaughtered very recently.