Name of “William Keith Christiansen” from Muriel Leo’s (nee Oliver, 1917-1998) Family Tree.

Date of birth and death, surname of “Christianson” from Richard Leigh Andrews. Surname changed to Christianson.

Year and country of marriage from search on New Zealand BDM website in May 2020:
1935/2313. Bride: Fay Ivy Ruth Andrews. Groom: William Keith Christiansen

Full date of marriage of 3 June 1935 from further searching in May 2020 on BDM Search by incrementally changing the date range for the marriage.

Brian of nzolivers noted the above marriage record has surname spelt, “Christiansen”. Brian checked electoral rolls. For example, in the New Zealand Electoral Roll - Stratford Main Roll 1969, found in May 2020:
Christiansen, Keith William, Raleigh Street, Waitara, dairy assistant
Christiansen, Fay Ivy Ruth, Raleigh Street, Waitara, shop assistant
Christiansen, Murray Keith, Raleigh Street, Brixton, lab technician [Son]

And, letter written dated 29 July 1979 from this Keith’s wife, Fay Christiansen, to Muriel Leo (nee Oliver) spells her surname as “Christiansen”.

Brian changed the surname back to “Christiansen” in May 2020.

In a letter dated 23 February 1983 to Muriel Leo (nee Oliver) from Margaret Oliver (nee Eves) where she wrote that her cousin, this Keith Christiansen, and his wife Fay (nee Andrews), “were hurt in a car accident last month. Fay was quite badly hurt but her husband did not seem to have been hurt so much and after a short time in hospital was with his daughter where he died suddenly on Jan 21st. Fay died on the day before his funeral was to have been, so it was a double funeral”.