The trial of an Irishman accused of killing a Spaniard in Tenerife two years ago has heard that his own blood was found on the murder weapon.
Keith Burke, 21, is accused of killing Abraham Báez following a row that was triggered by a confrontation by their girlfriends.
At the hearing in Santa Cruz, detailed forensic evidence from the prosecution concering DNA and other traces recovered from the scene was outlined to the court.
Mr Burke's blood was found a various spots near the scene of the killing and on the blade and handle of the knife used to carry out the fatal stabbing.
Dr William Rodríguez, one of two doctors who examined Mr Burke following his arrest in Playa de Las Américas, told the court that he had treated the defendant for a number of injuries.
These included two cuts to the index finger of Mr Burke's right hand which, he said, were most likely to have been caused by Mr Burke "holding the blade of a sharp knife very tightly".
Earlier, Mr Burke refused to look at a screen where photographs of the autopsy carried out on the deceased man were shown to jurors.
The prosecution drew attention to the evidence of several knife wounds, including the one to Mr Báez's his neck, which severed his carotid artery and caused his death almost immediately.
Also giving evidence were psychologists who examined the defendant to assess whether he was fit to stand trial.
According to the doctors, Mr Burke, who has been on remand in a Tenerife prison since May 2010, was "suffering from depression and anxiety" due to being in jail and had admitted to "drinking very heavily" during the four weeks he had been in Tenerife with his girlfriend, 30-year-old Sara Stuart.
She is accused of wounding Mr Báez's partner in the head with a small rock, which has also been produced in evidence.
However, in the doctors' professional opinion, the defendant was "completely aware of his actions and was fully capable of distinguishing right from wrong" at the time of the killing.
The jury also heard that during the assessment interview, Mr Burke admitted that he "remembered having the knife in his hand but could not remember stabbing the other man".
Doctors who examined him a second time in July of this year stated that they were "very surprised" that he could recall in great detail his exact movements and actions before and after the fight but remembered nothing about the fight itself.
Defence lawyer Avelino Míguez reminded the jury that the medical reports showed clearly that his client had "sustained various injuries, including blows to the head, during the confrontation with the more corpulent Mr Báez".
Mr Burke's lawyer later rejected an informal offer from the prosecution to consider downgrading the charge against his client from murder to manslaughter before the case concludes tomorrow.
In addition to the State Prosecution case, lawyers acting for the family of the dead man and for his girlfriend are conducting a private prosecution against Ms Stuart, whom they want to be convicted of murder along with her former boyfriend.
The nine-person jury is expected to begin its deliberation on Friday morning.
