Question: When did Mohammed El Senussi's father die?
Sentence (from "Hasan as-Senussi"): Sayyid Hasan ar-Rida al-Mahdi as-Senussi (1928 – 28 April 1992) was the crown prince of the Kingdom of Libya from 26 October 1956 to 1 September 1969, when the monarchy was abolished.
Relevant evidence: Yes