A woman caught on surveillance video ringing a doorbell in a Texas suburb at 3 in the morning has yet to be positively identified. However, a woman in Reno, Nevada, is convinced that the mystery woman is her sister Caitlin Denison, who has been missing since January. UPDATE: Texas authorities say they've identified the mystery woman who rang a doorbell in the middle of the night. She is 32 years old and is now safely with family out of state. Her identity is being withheld as she is a victim of domestic violence.