Mathew Day, a player, said that at a party, Doug Bollinger told him that ' I sledged Phil and Tom (batsman Tom Cooper) that day telling him "I'm going to kill you". I regret saying that so much'. Day told this to Hughes' brother who said Cooper told the same.
This, along with a supposed statement by Trent Johnston (head coach of NSW), led to allegations that NSW had tactics to bowl short to Hughes (something which the bowlers and Brad Haddin the captian denied) and this resulted in his death
Frankly I don't see what is the point of the whole thing. Bowling short is a legitimate ploy and plus, it's unlikely anyone bowled with the intention of causing fatal harm to the player. As
@Samid said this is unnecessary.