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Dibee also pleaded guilty to arson tied to a fire he helped set at the Cavel West Inc. meatpacking plant in Redmond, Oregon, in 1997 and to conspiracy to commit arson in a fire at the U.S.

Four years later after the Cavel West arson, Dibee helped destroy the Bureau of Land Management’s wild horse corrals in California.

At the time of the Cavel West arson, Dibee was 29.

Cavel West killed as many as 500 horses a week, shipping the meat to Europe.

The letter — which appeared to have been written with deliberate sloppiness — denounced the Cavel West plant’s role in horse slaughter and claimed its destruction was the work of a new group of radical environmentalists.