Oregon State Police (OSP) is continuing the investigation into the unattended death of an adult male at the Brothers Oasis Rest Area on Highway 20 located near Brothers, Oregon. The adult male was listed as a missing person from Sandy Police Department. On January 12, 2016 at about 2:45 PM, the Sandy Police Department took a missing person report of an overdue truck driver. Sandy Police Department listed the missing person as BRET ANDERSON, age 56, from Sandy. Sandy Police Department sent out an attempt to locate to various law enforcement agencies to be on the lookout for ANDERSON. A short time after the attempt to locate was put out, a concerned citizen in the Brothers area called OSP dispatch to report a semi-truck and trailer that had been parked at the Brothers Oasis Rest Area since last Friday and had not moved. At about 4:45 PM, an OSP trooper arrived at the rest area and located the semi-truck and trailer listed in the attempt to locate. The trooper made entry to the cab of the semi-truck and found ANDERSON deceased in the sleeper berth. Local first responders pronounced ANDERSON deceased at the scene. OSP troopers with the assistance of the Deschutes County Medical Examiner’s Office believe based on evidence at the scene that ANDERSON died of natural causes and there is no foul play suspected.