Name, date of birth, from Colin’s grandson, Robert Craig Marshall-Smith, in an email dated 1 September 2023.

Year and country of death, from death search on New Zealand BDM website in October 2023:
1970/39093. Davis, Colin John. Died age 44Y [Therefore born circa 1926 which matches]

Full date of death of 6 January 1970 from further searching in October 2023 on BDM Search by incrementally changing the date range for the death.

Year and country of marriage from search on New Zealand BDM website in October 2023:
1946/19923. Bride: Doreen Thelma Mitchell. Groom: Colin John Davis

Full date of marriage of 23 August 1946 from further searching in October 2023 on BDM Search by incrementally changing the date range for the marriage.

Place of burial, photo of headstone, from Find a Grave website found in October 2023:
https://www.findagrave.com/memorial/251565836/colin-john-davis
Name: Colin John Davis
Death: Jan 1970
Burial: Aramoho Cemetery, Whanganui, New Zealand
GPS-Latitude: -39.8930004, Longitude: 175.0931755
Plot: Monument Block R, Div. 6, Plot 320