Name, year of birth (1856) and death (1920), from Muriel Leo’s (nee Oliver, 1917-1998) Family Tree.

Year of marriage (1881) from official marriage search on New Zealand BDM website in June 2018:
1881/268, Bride: Elizabeth, Bride's Family Name: Terrill, Groom's Name: William, Groom's Family Name: McKoy

Occupation, full date and place of birth (10 Sep 1856) and death, full date and place of marriage, place of burial, from:
https://www.findagrave.com/memorial/137596201/william-mckoy

Different year of death (1857), country of birth, from search on New Zealand BDM website in October 2018:
1857/82. McKoy, William. Mother: Mary Anne. Father: Patrick

Full date of birth of 10 September 1857 from further searching in October 2018 on BDM Search by incrementally changing the date range for the birth.