Yavapai Silent Witness has increased the reward in the Grant Griffiths murder case from $75-hundred to ten-thousand dollars. The 58-year-old Griffiths was found dead in his Coyote Springs home, on Spur Lane in Prescott Valley, back on May 29th. Yavapai County Sheriff’s investigators say the murder may have taken place sometime the night before. If anyone has information into the case, call Yavapai Silent Witness 1-800-932-3232, or leave a tip at yavapaisw.com. A person that gives information leading to an arrest is eligible for the reward.