In June 1906, while returning from a trip to Australia on the ship "Oswestry Grange", Seddon had a massive heart attack and died suddenly 12 days before his 61st birthday, on 10 June. News of his death provoked numerous public gestures of grief, which included black-bordered displays in shop windows and several public monuments, including a memorial lamp post outside the St Helens Hospital in Pitt Street Auckland. Seddon was buried in Wellington's Bolton Street Memorial Park, with his grave being marked by a large monument.