The Oregon State Police is looking for information about a Saturday incident on Interstate 84 in Sherman County that left a man with severe head trauma.  According to the OSP, an emergency call said a subject was lying face down in the gravel in front of his pickup that was pulling a travel trailer.  Troopers found the vehicles parked at the bottom of the exit 109 westbound off-ramp and found 38-year-old Derek Martell of Veneta behind the wheel and unresponsive.  The OSP says Martell was headed home from an elk hunting trip with friends.  Troopers found out that Martell spoke to his wife at 11:30 a.m. Saturday and there were no issues, the 9-1-1 call was received 28 minutes later, and troopers located him at 12:26.  The OSP is requesting anyone who might have been traveling from Arlington to Rufus during that time of day or anyone with information regarding the incident to contact Oregon State Police Dispatch at 1-800-442-2068 or *OSP from your mobile device, reference case #: SP21274660.  Martell was life-flighted to a hospital for treatment.