Herald interpreter Francisco Franca was in court and said psychologist Antonio Claudio dos Santos told how he had treated Colares Tavares from March to June last year while the criminal was in jail for another crime, which the Herald understands was robbery.
But Colares Tavares stopped the treatment, Mr Franca said.
"When he got his conditional sentence he stopped the treatment because he was kind of ashamed of not paying for it.
"At that time Ricardo was undergoing a serious depressive crisis. Asked if this crisis could cause any disturbance so that one can't know what he's doing, he said 'Yes'."
Mr Franca said the psychologist's evidence was full of contradictions, however, and the federal prosecutors complained to Judge Anselmo da Silva that they did not believe him.
The prosecutors were apparently given 48 hours to analyse the new evidence.
After that the defence lawyers get a chance to add any more facts, then Judge da Silva will decide whether they are valid.
It is understood the judge may make a final judgement in the case late this month or early next month - sooner than expected.
Colares Tavares and five other members of his gang are accused of latrocinio, or armed robbery leading to death.
The six were in court, again hand-cuffed to one another wrist by wrist, but did not get the chance to speak.
At an earlier court hearing, Aucklander Geoff Bullock, who was on board the Seamaster when Sir Peter was killed, told how he saw Colares Tavares shoot into the area below deck "as if target shooting".
Mr Bullock could not see as two of the shots went into the back of his friend, killing him almost instantly.
Three other witnesses were heard at Wednesday's court hearing but Mr Franca said they did not add much.
One of them was Irandir Batista Cardoso, father of one of the accused, Jose Irandir Colares Cardoso (known as "Junior").
He said he did not know his son was involved in the Seamaster crime or any other criminal activities.
While his son knew Colares Tavares, this was because they were cousins, not because they were friends.
A taxi driver, Nilson Palheta Martins, who knew one of the accomplices, Antonio Goncalves de Lima, nick-named Uncle Martinho, said Goncalves de Lima was honest.
Goncalves de Lima accepted Sir Peter's stolen rifle as payment for moving an injured member of the gang.
Mr Martins told the court it was normal to receive objects as payment, but he had never heard of the object being a rifle.
Mr Franca said the fourth witness had not known any of the criminals and had nothing to say.
Peter Blake, 1948-2001
