A man accused of stabbing his girlfriend to death in her Macgregor home told forensic officers that a cut on his hand came from doing push-ups near broken glass, a court has heard.
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Aleksander Vojneski, 31, is on trial for the murder of mother of three Paula Conlon on the night of March 27, 2012.
The pair had been in an on-and-off relationship after meeting at the psychiatric unit of Calvary Hospital, Ward 2n, some months earlier.
Vojneski was an ice user with a history of mental health problems and the Crown allege he had a tendency for violence and the use of knives.
Ms Conlon was found dead in her home with 11 stab wounds, some of which were defensive.
The Crown has spent much of this week and late last week leading forensic evidence about the murder from a range of forensic officers involved in the investigation.
On Tuesday, the jury was shown the beginning of a video recording of Vojneski as he underwent a forensic procedure after his arrest.
The video showed blood samples being taken from Vojneski and forensic officers photographing his body.
The court heard earlier in the trial that there was a cut on Vojneski's index finger, which police say was consistent with a knife slipping back in the hand when it hit something hard.
During the forensic procedure, Vojneski give an explanation for the injury. He said he was doing push-ups at a friend's place near a broken bottle.
Vojneski also explained other markings by saying he had punched a wall in his cell.
Earlier in the day, the court heard from textile damage experts, who interpreted the damage to Ms Conlon's clothing.
It also heard from police who looked at a tyre mark found outside the Macgregor home, which they said they had determined was old.
An executive from Chefs Toolbox, a party planning-type company, also gave evidence that Ms Conlon was recorded as having bought two sets of stainless steel knives, with five knives and a pair of scissors each, and another package which included a fusion knife.
The Crown alleges that a fusion knife was used in the murder but it has never been recovered.
The trial continues before Justice John Burns on Wednesday.