This is truly tragic news, I'm so sorry to hear this and my deep heart felt Condolences go out to his friends, colleagues and family.
I've confirmed Simon's sudden and tragic passing here in NZ with a reliable source and it is a shock to his work associates. It grieves me to hear the sad news.
Na hoki atu aianei, haere hoki i runga i te rangimarie (Wherefore now return, and go in peace)