BOSTON (CBS0 – The jury began deliberations in the murder trial of Bampumim Teixeira Monday. They broke for the day without reaching a verdict.

Before they began deliberations they heard from the prosecution and defense one last time during closing arguments.

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“You are about to embark on one of the most difficult things that’s you are called to do,” said defense Attorney Steven Sack. Sack made his roughly 45 minute closing argument before the jury on day ten of the murder trial.

Dr. Richard Field and Dr. Lina Bolaños. (WBZ-TV)

He reminded them the prosecution must prove beyond a responsible doubt. “It doesn’t mean possibly somebody is guilty,” said Sack.

Dr. Richard Field and Dr. Lina Bolanos were stabbed to death inside their South Boston penthouse May 5, 2017. Their family and friends held back tears as Sack repeatedly claimed Teixeira killed Dr. Field in self defense and that his client was having an affair with Bolanos.

“He told Sgt. Devane and now you’ve heard that he did kill Richard Field, but he killed in self defense and that’s not murder,” said Sack.

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Roughly 30 witnesses and 300 exhibits were presented in the trial.

Bampumim Teixeira in Suffolk Superior Court November 21, 2019. (WBZ-TV)

During his closing argument, prosecutor John Pappas said the evidence is overwhelming. “There was no real or imagined relationship between the defendant and Lina Bolanos,” said Pappas.

Pappas showed the jury some of the items again that have been linked to the defendant including a bag containing masks, a fake mustache and duct tape. Pappas also holds up a BB gun he says Teixeira had.

Pappas said Teixeira planned out his attack and robbery having knowledge of the building as a former employee. He said Teixeira’s statement to police was a made up story that has too many gaps. “No more time to say he’s the protector of Lina. No more time to say he’s acting in self defense,” said Pappas.

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Deliberations will resume Tuesday morning. The jury is considering seven counts including first degree murder.