Andy's father, Hawke's Bay-based Alan Marshall, said it was emotional to catch up with Sergeant Donkin, who did a "great job" organising the memorial.
"We are quite pleased with how it has all come together," Mr Marshall said. "The plaque has come out really well and Andy's photo looks very realistic."
Mr Marshall told Hawke's Bay Today it was difficult to return to the site on the anniversary but he felt it was the right thing to do for his son, who would have turned 33 in December.
The memorial lies in the pavement outside Cottesloe's Ocean Beach Hotel.
"We hope it will send a powerful message about the devastating effects of violence.
"We want to draw attention to the irreversible consequences violence can have and the pain and grief it causes," Mr Marshall said.
Schmidt was jailed for Marshall's murder in 2012 and given a minimum sentence of 14 years.
He admitted pushing Andy, causing him to fall seven metres to the ground, but claimed he did not mean to kill him.
Schmidt was acquitted of murder on appeal but found guilty of manslaughter and was jailed last year for nine years.
Andy's cousin, Scott Guy, was shot dead at his Feilding home in 2010.
