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Dennis was last seen in Las Vegas, Nevada on July 22, 1984. She was a passenger in a maroon 1970 Ford station wagon being driven by Stephen Jack House. There was a storm and they were trying to cross high water near the corner of east Washington Avenue and Lamb Boulevard when their vehicle flipped over and was swept away. The car and House's body were later located, but Dennis has never been heard from again.
Dennis got married in June 1983. Her divorce was finalized on July 16, 1984, just six days prior to her disappearance. Her mother died in 2012 and Dennis's father is also dead, but she has several siblings who are still alive. She is presumed to have drowned.