Today, Detective Senior Sergeant Jason Stewart confirmed Ms McKay's death was not considered suspicious but refused to comment further.
Ms McKay will be laid to rest at a funeral in Christchurch this morning.
The family has asked Mr Brown not to attend funeral.
On Facebook, he paid tribute to "the love of my life".
"To a gorgeous, great mum, a best friend, a person who all put others before herself and a person who had the crazyest most out going personality ever, u touch the hearts and brought smiles and laughs to every one you meet Libby, R.I.P babe u will for ever be in my heart, I miss you so much xxxx."