---
category: Law Enforcement & Legal
summary: Mayer's attorney/client files reportedly contained documentary evidence from
  his client, Ben Kalka, regarding Kalka's business ties with Michael Riconosciuto
  at R & R Research, at the laboratory facilities at Hercules, California, and Dr.
tags:
- Person
- Lawyer
- LawEnforcement
---

[David Mayer](/people/david-mayer/) was an attorney from Marin County, [California](/places/california/). He represented [Calvin Robinson](/people/calvin-robinson/), who was dubbed the "drug tug" captain by local media. Mayer obtained the assistance of attorney [David Mayer](/people/david-mayer/) to represent him at his 1989 trial. However, on February 6, 1989, the night before Mayer was to appear in court to defend Robinson, he died from a gun-shot wound. His death was ruled a suicide, and a suicide tape was found.[^1]

Mayer's attorney/client files reportedly contained documentary evidence from his client, [Ben Kalka](/people/ben-kalka/), regarding Kalka's business ties with [Michael Riconosciuto](/people/michael-riconosciuto/) at R & R Research, at the laboratory facilities at Hercules, [California](/places/california/), and [Dr. John Philip Nichols](/people/dr-john-philip-nichols/).[^1]

---

[^1]: Seymour, Cheri. *The Last Circle: Danny Casolaro’s Investigation into the Octopus and the PROMIS Software Scandal*. First Edition. TrineDay, 2010.