The person at the center of this case
Joan Rosenthal, 75-year-old White female
Homicide · Open - Unsolved
17 years waiting · since 2009
VICTIM - JOAN ROSENTHAL - TIBURON, CALIFORNIA
Justice for Joan Rosenthal, 75-year-old White female — the trail went cold in 2009, but the truth hasn't.
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Key leads to think about
🎯
suspect
Lead #1Who had access to Joan Rosenthal's property and knowledge of her routine?
🔍
evidence
Lead #2What type of firearm was used and where did it come from?
👁️
witness
Lead #3Did any neighbors hear the gunshot or see suspicious activity on the evening of September 21?
On September 21, 2009, Joan Rosenthal, a 75-year-old widow, was shot once in the head at her Tiburon home and discovered by her housecleaner the following morning. The crime occurred in this quiet residential community north of San Francisco, and investigators have not identified a suspect or clear motive despite more than a decade of investigation. Anyone with information about this unsolved homicide is encouraged to contact the Tiburon Police Department.
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More leads to consider
Beyond the top three above — each detail below could be the thread that pulls this case open.
💡
clue
Lead #4What was the motive—was this a robbery, targeted crime, or random act?
👤
person
Lead #5Were there any recent conflicts or unusual interactions in her small circle of friends?
Have information about any of these leads?
Even the smallest detail could be the key to solving this case.
Official wording
Source Narrative
Tiburon, California September 21, 2009 On September 22, 2009, at approximately 10:00 a.m., the body of Joan Rosenthal, a 75-year-old White female, was discovered outside of her residence in Tiburon, California. Tiburon is a small town located approximately 20 miles north of San Francisco.
Rosenthal was found by her housecleaner inside her enclosed front yard near her front door. She had sustained a single gunshot wound to her head.
Investigators determined the time of death to be approximately 9:00pm the night before on September 21, 2009. Rosenthal was recently widowed and living alone.
She was a grandmother, library volunteer, had a small circle of friends, and did not travel much outside of Tiburon. Her homicide is still unsolved.
Anyone with information is urged to contact the Tiburon Police Department.
Timeline of Events
👤
2009-09-21
21:00Time of Death
Joan Rosenthal was shot once in the head at her residence in Tiburon
🔍
2009-09-22
10:00Body Discovery
Housecleaner discovered Joan Rosenthal's body outside her residence near the front door
Key Locations
Interactive map showing important locations related to this case
Case Information
Incident:September 21, 2009 at 9:00 PM
Last Updated:October 29, 2026
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Case Information
Incident:September 21, 2009 at 9:00 PM
Last Updated:October 29, 2026