It will be held on Friday, July 19 at St Patrick’s Cathedral in central Auckland from 2pm.
A wake will follow at Eden Park.
In the announcement, McKay was described as a beloved wife of 47 years, a devoted mother to Matthew, Sam and Wyatt and a “cherished grandmother” to Cooper, Everly, Mason, and Lilah.
“She also had a special bond with her daughters-inlaw, Sara, Ashley, and Emily, and was dearly loved by her jack russell Archie,” the family notice read.
A local man tackled a second offender - 18-year-old Jayden Cunningham - but was shot at from the getaway car by a third man identified as Malachi Darnell, also 18.
Spitzer said Cunningham was arrested after “bailing out of the vehicle” and McCray and Darnell were arrested after a police chase.
All three have been charged with special circumstances murder and were being held without bail.
The charge included the felony enhancement of causing the death of an elder over 65.
The men also face other charges including attempted murder, attempted robbery, use and discharge of a firearm and evading while driving recklessly.
In a statement, the McKay family expressed their “deep gratitude” for the support they had received since the death of the wife and mother.
“In particular, teams from the Ministry of Foreign Affairs, the New Zealand Embassy in Washington and the office of Consulate General in Los Angeles have been extraordinary in the work they are doing helping our family, including liaising with state and federal authorities in the US.
“Thanks to this heartfelt and expert support, along with the excellent work of all the US authorities including the team from Orange County, and especially Newport Beach Mayor Will O’Neill, great progress is being made to return Trish to New Zealand and we hope to have her home within the next week.
“Once her return is confirmed we’ll advise of plans for Trish’s farewell.”
Anna Leask is a Christchurch-based reporter who covers national crime and justice. She joined the Herald in 2008 and has worked as a journalist for 18 years with a particular focus on family violence, child abuse, sexual violence, homicides, mental health and youth crime. She writes, hosts and produces the award-winning podcast A Moment In Crime, released monthly on nzherald.co.nz