Law enforcement officers have issued an alert for a San Diego man who a friend says has vanished without a trace.
Ralf Peeks, 43, was last seen April 21 according to San Diego police.
A local engineer, Peeks is a German citizen with no known family in the area.
Investigators say Peeks was riding his black mountain bike on Camino Ruiz in the Miramar area and he hasn’t seen since.
Peeks never returned home and did not show up to his job the following day.
Alex Ciric shared a house with Peeks and has searched hospitals and canyons wondering if the avid cyclist was injured or perhaps killed without identification..
"You don't know what happened, it's become a mystery, something that was so unexpected," said Ciric.
Friends say police have Peeks passport, money and computers. He did not own a cell phone or a car, they said.
“Our records through TSA don't show he's gone out of the country at this time. We do have some of his personal property," said San Diego police Lt. Ernie Herbert.
Officers describe Peeks as about 6-foot-1, 190 pounds with blond hair, blue eyes.
Detectives are asking anyone with information regarding his location to call the S.D.P.D. Homicide Unit - Adult Missing Persons Section at (619) 531-2293 or the Crime Stoppers anonymous tip line at (888) 580-8477.