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Allison was last seen riding her black, purple and white mountain bicycle in front of San Ramon Valley High School, where she was a sophomore at 8:00 a.m. on May 23, 2011. She has never been heard from again. Her family reported her missing that afternoon when she didn't come home from school. At 4:45 a.m. the next day, her bike was found locked to a rack in the Battery East parking lot east of the San Francisco side of the Golden Gate Bridge. Allison's bike helmet was hanging from the handlebars.
Authorities determined Allison took a the Bay Area Rapid Transit (BART) train from her Danville, California home to the Embarcadero stop in San Francisco and then rode her bike nine miles across the city to the Golden Gate Bridge. She jumped from the bridge at approximately 10:00 a.m. the day of her disappearance. She left behind suicide notes for her family and friends, and her computer history showed she'd looked up directions to the bridge. She was a popular straight-A student, ran track and was a member of the junior varsity swim team in 2011, and she also enjoyed playing the piano and posting her musical performances on the internet. Her body has never been found.
Contra Costa Sheriff's Office