- Eugene Mallove (2004): A cold fusion advocate beaten to death. Officially a robbery/murder tied to a tenant dispute over evicted renters trashing his property. Multiple perpetrators were convicted (manslaughter and murder charges)

Eugene Mallove - Wikipedia
- Stanley Meyer (1998): Claimed a "water-powered car." Died suddenly after dinner, saying "They poisoned me." Autopsy ruled cerebral aneurysm due to high blood pressure; toxicology found no poison. His device was deemed fraudulent by courts
Water fuel cell - Wikipedia
- Rory Johnson (late 1970s): Alleged cold fusion magnetic motor inventor. Reportedly died after moving labs under DOE pressure. No verified details on cause of death; claims of suppression (gag orders) are anecdotal and unconfirmed.
Rory Johnson: Magnatron engine
Rory Johnson, Magnatron engine
- Arie M. deGeus (2007): Patented zero-point energy ideas. Found unresponsive in airport parking; autopsy suggested heart failure (natural causes). Conspiracy sites speculate assassination before funding meetings, but no homicide evidence.
Project Camelot | In Tribute | Arie DeGeus