295 Cases Solved. Advancing justice for missing persons, unsolved homicides, unidentified and unclaimed remains.

Allison Bayliss Missing Person Case

Last seen in Danville, California on May 23, 2011

Victim Details

Created

Jul 10, 2011

Case Added

Mar 28, 2023

Firstname

Allison

Lastname

Bayliss

Current Age

Age At Disappearance

Height

68 inches

Weight

125 lbs

Ethnicity

White / Caucasian

Gender

Female

Last Seen

May 23, 2011

City

Danville

State

California

County

Contra Costa County

Zip Code

94526

Tribal Land

Agency ID

27746

Agency Name

Contra Costa County Office of the Sheriff- Danville

Agency City

Danville

Agency State

California

Agency County

Contra Costa County

Agency Zip Code

94526

Agency Contact

Agency Address

510 La Gonda Way, California

Agency Phone

9253143700

Agency Jurisdiction

County

Agency Type

Law Enforcement

Agency Website

https://www.cocosheriff.org/bureaus/field-operations/special-operations-division/danville

Agency Case #

SP1109049

Primary Agency

Contra Costa County Office of the Sheriff- Danville

Hair Color

Brown

Left Eye Color

Blue

Right Eye Color

Blue

Last Updated

10/10/2026

Area Last Seen:

Case Description

Any updates on this case? Let us know!

Allison Taylor Bayliss, a 15-year-old from Danville, California, disappeared on May 23, 2011. She was last seen riding her bicycle near San Ramon Valley High School. Later, her bike was discovered locked near the Golden Gate Bridge. Evidence, including search history and notes left behind, suggests Allison took her own life by jumping from the bridge that day. Allison was a high-achieving student, involved in sports and music, but struggled with personal challenges. Her body was never recovered, and her case remains a tragic loss for her family.
Last Seen: May 23, 2011