It is named after http://en.wikipedia.org/wiki/Ettore_Majorana and he disappeared suddenly under mysterious circumstances while going by ship from Palermo to Naples. He might not have met his anti-Ettore if this is correct:
http://www.science20.com/quantum_diaries_survivor/ettore_majorana_mystery_might_be_solved-79823
Seems to me the best possibilities are suicide,Kidnapped or fled to Argentina.