The family had said that complications from his surgery in 2012 led to his death, according to documents made public Tuesday.
The FBI said Jeffrey Clark Jr. is a self-described white nationalist who described the Pittsburgh synagogue as a "hero."
The so-called Museum Fire, just north of Flagstaff, was 10 percent contained Tuesday evening, thanks to showers and weather conditions, officials said.
Brandon Theesfeld, 22, was charged with murder in the death of Alexandria Kostial, 21, whose body was found on Saturday morning in Mississippi.
Thousands of protesters have opposed the construction of the Thirty Meter Telescope at Mauna Kea's summit, a site considered sacred by Native Hawaiians.