I found no death registration nor burial. I found this on electoral rolls:
Name: Maund Arthur Leonard Mckean
Electoral Year: 1957
Region or Province: East Cape
living at 4 Domett Street, occupation accountant. Jeannette Shirley McKean at same address.
Maund Arthur Leonard Mckean married Jeannette Shirley Davis in 1955. 1957 is the only time either of them appears in New Zealand records.