He disappeared after dropping off his wife at the train station in Santa Barbara, California.
In 1910, Clark constructed a second mansion on Hayden Lake, Idaho, as a summer home.
The train was scheduled to depart at 11:30 p.m. F. Lewis Clark kissed his wife goodbye, then returned to his limousine.
Instead of entering the vehicle however, F. Lewis Clark dismissed his chauffeur and valet and walked into the night.
According to a New York Times article from two days later, he was 'believed by police to have committed suicide by jumping from a pier' in Santa Barbara, as his hat had been found in the water.