At about 11:39 EDT, a Grumman Goose operating as a Part 135 competency flight lost power on one engine and crashed into a canal about 2 miles south of Fort Lauderdale Executive Airport. The pilot was killed and the FAA observer was seriously injured. The flight originated from Watson Island in Miami about 10 minutes before the accident. The pilot contacted the control tower and reported 3 miles south for landing. The controller asked the pilot to state type of airplane, but the pilot replied by declaring an emergency due to a left engine failure. The controller cleared the aircraft for landing, but there was no other communication. The FAA observer said the airplane went down like a rock while turning toward the canal. The amphibian struck a tree and crashed into the canal.