Environmental activist Homero Gómez González, missing for two weeks, was found dead Wednesday in a well in the Mexican state of Michoacán.

Gómez, 50, who was last seen alive on January 13, was known for his work defending the habitat of the monarch butterfly. The State Human Rights Commission of Michoacán had earlier said that he may have been targeted because of that work, particularly his campaign against illegal logging.

The body was found in an agricultural well in the community of Ocampo, near El Rosario Monarch Butterfly Preserve, which Gómez managed. The well was about 20 feet deep and half-filled with water, said the state prosecutors’ office of Michoacán.

An autopsy will be conducted to determine the cause of death.

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Dozens missing among Oregon wildfires; officials fear two huge blazes could merge According to a World Wildlife Fund report, clandestine logging of forests has greatly reduced the winter habitat of the monarch, known for its long seasonal migrations from Canada to Mexico.

Gómez’s was the second death in recent days of a Mexican activist. On Saturday, Isabel Cabanillas, 26, of the feminist organization Hijas de su Maquilera Madre, was found dead in Ciudad Juarez, Chihuahua.

Michoacán is one of five Mexican states covered by the sternest “do not travel” warning from the U.S. State Department because of kidnapping, gang violence and other crime.