The penalty phase of the trial begins Tuesday. Jurors will recommend whether Oyler will face life in prison or the death penalty.
Riverside County Fire Chief John R. Hawkins told reporters outside the courthouse that he hoped the verdict would console the families of the firefighters killed in the blaze.
"They can rest now knowing that the man responsible will pay for his actions and no one else will suffer as they have," Hawkins said.
Capt. Mark Allen Loutzenhiser, 43, and firefighters Jason Robert McKay, 27, Jess Edward McLean, 27, Daniel Hoover- Najera, 20, and Pablo Cerda, 24, were killed in the blaze.
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