Son, 28, of former Harper Collins and NBA executive Gregory Giangrande is killed in motorcycle crash along with pal as they returned from Full Moon Party in Thailand

Elias Giangrande, 28, and his friend Jack Niehaus, 25, were 'drunk and speeding' without wearing helmets when they crashed into a taxi along a dimly lit road on Koh Pha Ngan island on April 24.