Mariposa County sheriff's detectives say the shooting happened in the Stumpfield Mountain Rd area late Saturday evening.
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They say one of the victims was declared dead at the site of the shooting, while the two others with gunshot wounds drove themselves to a local hospital for treatment.
The sheriff's office says this is the second illegal grow in the area it has been called to where weapons have been involved.
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The California Department of Justice Crime Scene Unit out of Fresno is responding to the area to help investigate.