---
category: PROMIS Scandal
summary: Deputy appointed by Sheriff Ken Mattheys to investigate Ron Van Meter's disappearance
  and internal affairs in Mariposa County.
tags:
- Person
- PROMIS
---

[Lonnie Hammond](/people/lonnie-hammond/) was a deputy appointed by Sheriff [Ken Mattheys](/people/ken-mattheys/) to handle the internal affairs aspect of the investigation into [Ron Van Meter](/people/ron-van-meter/)'s disappearance. Hammond was a former cop from the Southern [California](/places/california/) area.[^1]

---

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