Investigators say he's responsible for the Bear Fire and they have witnesses who saw the arson happen.
The Bear Fire was destructive and dangerous, not only did it destroy homes, buildings and vehicles, but several firefighters were also injured.
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Sheriff's investigators believe 54-year-old Marlon Coy set the fire in this area below Diane's Way near Boulder Creek, based on interviews with three people who saw it happen.
RELATED: Suspect charged with multiple arson counts in Bear Fire
Coy appeared to mouth the words "you're next" toward the district attorney during his hearing. The district attorney told ABC7 that they are looking into Coy's actions in court to determine if more charges should be filed.
Detectives say Coy was in a relationship with a woman where the fire originated. But there had been some sort of dispute.
He was arrested on October 17, the day after the fire started, not for arson, but because he allegedly stole jewelry from an evacuated home.
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Coy faces four felony counts in connection to the fire and seven felonies for an alleged burglary and shooting.