Derek Chauvin invokes 5th Amendment during murder trial

On Thursday, Chauvin told the court he will not testify in his own defense. Dr. Martin Tobin, a pulmonary physician, was called to rebut testimony of a defense medical expert witness.
1:42 | 04/15/21

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Transcript for Derek Chauvin invokes 5th Amendment during murder trial
To the other news tonight and the trial of officer Derek chauvin in the George Floyd case. Chauvin speaking for the first time in court today as he invoked his fifth amendment right against self-incrimination, telling the judge he will not take the stand. Alex Perez from Minneapolis. Reporter: Former police officer Derek chauvin today, for the first time, speaking in court. Declaring he won't testify in his own defense. Telling his lawyer and the judge he was invoking his fifth amendment right against self-incrimination. I have repeatedly advised you that this is your decision and your decision alone. Right? Correct. We have gone back and forth on the matter, would be kind of an understatement, right? Yes, it is. Have you made a decision today whether you intend to testify or whether you intend to invoke your fifth amendment privilege? I will invoke my fifth amendment privilege today. Reporter: Chauvin's lawyer then resting his case, but the prosecution wasn't finished. They called a rebuttal witness to challenge the new defense theory that George Floyd's death may have been caused in part by inhaling carbon monoxide from the tailpipe of the police vehicle. It's simply wrong. Reporter: Dr. Martin Tobin, an expert on lung function and breathing, who previously testified for the prosecution, returning to the stand today. He told the jury carbon monoxide levels in Floyd's blood were normal. And it was at most 2%. At most 2%. Normal? I mean, which is normal. Reporter: And, David, the jury will be sequestered during deliberations, which could begin as early as Monday afternoon. The judge telling jurors they should pack a bag, plan for long, but hope for short. Alex Perez again tonight. Thank you, Alex.

This transcript has been automatically generated and may not be 100% accurate.

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