SAN FRANCISCO, June 3 (UPI) -- As the 40th anniversary of U.S. Sen. Robert F. Kennedy's assassination approaches, some investigators say there are unanswered questions.
Kennedy was gunned down on June 5, 1968, at the Ambassador Hotel in Los Angeles, a few moments after claiming victory in the California presidential primary. Sirhan Sirhan, the Palestinian immigrant convicted of killing him, remains in a California prison.