Martin's nehu (funeral) will be held at Waiteti Marae tomorrow [Wednesday], where he is lying in state.
Anderson said it was with "great sadness" she announced her partner's death.
"Moe mai ra, takoto mai e Richie. You will be so missed. Taken too soon. Your huge smile will live on in us. Arohanui."
Martin was the son of Trevor and Kathleen Martin and brother to Trevor, Nupi, Tania, Adrian, and Steve. He is survived by children Samuel, Richard and Nadia "and loved by his many mokopuna". He will also be deeply missed by Anderson and children Soltice, Diaz and Jasmine.
A Givealittle page set up by Martin's whanau in the days after the crash managed to raise $6675. While the costs were initially to help Martin in his road to recovery and to help cover accommodation and food costs for those at his side, the money will now be used to go towards funeral costs.
Anyone considering attending the nehu is asked to wear masks while on marae and if sick, to remain at home.