"Had he not seen that we don't know how long it could have been before someone else drove by," Lieutenant Stephanie Josephson said.
The body was found just north of Reid's Roost Road. The area is not heavily populated or traveled. The San Mateo County Sheriff's office brought in loads of detectives, officers and even their SWAT team to help with the investigation.
"They're looking to see if there is any information that there is a suspect-at-large or maybe that there's some evidence they can find," Lt. Josephson said. "They're trained in searching these kinds of areas. Its rough terrain and rural."
Deputies are calling the case a homicide, but wouldn't confirm what signs led them to that. A white car was towed from the scene to collect evidence.
Investigators are asking everyone in the area to be alert.
"Please report anything suspicious," Lt. Josephson said. "Anyone suspicious that you see. Please don't open your doors for anyone you don't know, unless they can confirm it's a law enforcement officer."
Deputies are asking residents to please avoid the area of Skyline Boulevard and Reid's Roost Road.
Investigators towed a white car from the scene to collect evidence. Anyone in the area is being asked to stay alert and report anything or anyone suspicious. @abc7newsbayarea pic.twitter.com/FFtVPHIDoZ— Jobina Fortson (@JobinaFortson) June 18, 2019
#HAPPENINGNOW: The San Mateo Co. Sheriff’s Office is investigating a homicide. A deputy was on Skyline Rd last night when they spotted a man’s body on the side of the road @abc7newsbayarea pic.twitter.com/htASJivrOf— Jobina Fortson (@JobinaFortson) June 18, 2019