A sobbing man told Sydney police: "I want my baby back, she's dead, she killed herself."
Gavin John de Beyer then motioned as if he were holding a knife with both hands and thrust it towards his stomach, a jury has been told.
![Sharon Michelutti, 48, was allegedly murdered by her defacto partner in Sydney's south-west on Monday. Photo: Facebook](/web/20170515070638im_/http://www.brisbanetimes.com.au/content/dam/images/g/w/2/p/p/4/image.related.articleLeadwide.620x349.gw56x8.png/1494828651232.jpg)
He said he tried to save his wife, Sharon Louise Michelutti, who had jumped on a knife, the NSW Supreme Court heard on Monday.
A number of police officers gave evidence on Monday in the trial of Mr de Beyer, 51, who has pleaded not guilty to murdering Ms Michelutti at their Riverwood home on February 1, 2016.
They testified to seeing a sobbing man, wearing a red top, jeans and a red cap, in the foyer of the Campsie police station about midday on February 1.
As he cried uncontrollably, saying, "She's dead," he slumped onto the floor.
Senior Constable Vanessa Bolas said she heard moaning and loud sobbing before she saw a man curled up in a fetal position on the floor.
When she bent down she recognised him "from previous dealings with him and his family over the past 10 years".
The jury was shown CCTV footage, which did not record sound, of the man going into the foyer, and then lying on the floor.
Mr de Beyer was taken to another area where he slumped on a sofa, getting up and down, and continued to sob, saying his wife was dead.
Senior Constable Bill Moussa-Khalil told the jury he heard the man say: "She was holding a knife and she jumped on it."
Sergeant Bartholomew Ganaine heard him say: "My baby is dead, she killed herself, I tried to save her."
Another officer testified that he had previously attended the couple's house in relation to domestic incidents between the couple.
Ms Michelutti, who died of a single stab wound, was found on her bed with the covers pulled over her whole body.
The trial is continuing.
AAP