Niko Reid-Manuel, 25, of Cromwell, died in Bannockburn Rd after his car rolled on the rural stretch of road on October 10.
"We invited Riley to come to the blessing of the site with the local kaumatua.
"He joined us at the blessing then came to the funeral this week.
"We are very grateful to Riley for being with Niko in his last moments and will always look out for him."
The family also thanked their friends, family and community for all the support they have received.
"We are so lucky to have such a caring community.
"Fly high Niko."
A family friend set up a Givealittle page to provide support for the family, which was flooded with messages of love and support for the family.
Speaking to the Otago Daily Times after the crash Riley said he did not hesitate to jump into action despite it being his first experience of real CPR, having only done some first aid through school.