Passage: During the early 1940s, Albert Kothe (the sign's official caretaker) caused an accident that destroyed the letter H. Kothe, driving while intoxicated, was nearing the top of Mount Lee when he lost control of his vehicle and drove off the cliff directly behind the H. While Kothe was not injured, his 1928 Ford Model A was destroyed, as was the original 50 foot (15.2 m) tall illuminated letter H.

Question: who caused the accident
Albert Kothe