Shark attack, 1958-12-13 (Unprovoked)
Location: Near Twin Islands off Lanikai, O'ahu (east coast), Hawaii, USA
Time: 13h00
Activity: Surfing on air mattress
Victim: William S. Weaver (M, age 15)
Injury: FATAL, leg severed  
Fatal: Y
Species: Tiger shark, 4.6 m to 7.6 m [15' to 25'] 
Source: A. L. Tester