/ CBS NEWS. Family photo/Photo by Kyle Harris ... Get the latest updates in news… ""It's not an assumption," Fowler replied. On redirect questioning by defense attorney Eric Nelson, Fowler said the larger a person, the more likely they are to inflict injuries or bruising on a person while restraining them. USA-RACE/GEORGEFLOYD (UPDATE 5, PIX, TV):UPDATE 5-Defense expert testifies George Floyd died of heart disease, car exhaust fumes msn back to msn home news powered by Microsoft News Get Derek Chauvin trial live updates and news on George Floyd's death. Also on Tuesday, Minneapolis Park Police officer Peter Chang testified he responded to the scene. Fowler agreed the pills found in the squad car were obviously not in Floyd's body, and no pills were found in his stomach during autopsy. You've been vaccinated. Prosecutors also wanted to introduce new evidence, saying that they had learned since Wednesday that Hennepin County does, in fact, have tests on carbon monoxide levels in Floyd's blood. After recalling Dr. Martin Tobin Thursday morning as a rebuttal witness, the prosecution again rested its case, meaning no more evidence will be introduced in the Derek Chauvin trial. He had earlier denied a defense request for the jury to be further questioned and immediately sequestered in light of the fatal police shooting Sunday of Daunte Wright in nearby Brooklyn Center, which led to several nights of protests. Fowler also testified that he would classify the manner of death “undetermined,” rather than homicide, as the county's chief medical examiner ruled. A string of medical experts have testified for the prosecution, saying the police restraint restricted oxygen to Floyd's body and caused his heart to stop. Thousands bid farewell ahead of funeral of the black man whose death inspired worldwide anti-racism protests. The defense launched its case on Tuesday. Chauvin is charged with second-degree murder, third-degree murder and second-degree manslaughter. Fowler testified he could not find evidence in medical literature that Chauvin's knee would have impaired the function of Floyd's hypopharynx, a small area at the bottom of the throat, as a pulmonologist earlier testified for the prosecution. Get Derek Chauvin trial live updates and news on George Floyd's death. Fowler testified that Floyd had an enlarged heart, which required more oxygen, and narrowed arteries -- some up to 90% -- that would result in reduced blood supply to his heart. Prosecutors do not need to prove that Chauvin intended to cause Floyd's death. Fowler testified Chauvin's knee was not blocking Floyd's airway. Fowler is now testifying about the effect of carbon monoxide on the body, noting Floyd's position as he was being restrained near the running squad car's exhaust pipe. Court recessed following extensive direct testimony from and cross-examination of defense expert witness Dr. David Fowler, a retired forensic pathologist who was the chief medical examiner for the state of Maryland for 17 years. "I would fall back to undetermined.". If Tobin were to reference the new test results, the judge said, it could lead to a mistrial. Physical exertion, he said, increases the heart's demand for oxygenated blood. "The moment of death is not something you can easily document," Fowler said. Brodd said he believes Chauvin was justified in restraining Floyd, acting with objective reasonableness and following Minneapolis police training. Among those testifying for the defense were two expert witnesses, a former forensic pathologist and a use-of-force expert. Fowler said Floyd "goes from pretty much fully functional and coherent to unconscious very rapidly," indicating a sudden cardiac event. Nelson asked Fowler to describe a study that called into question the dangers of positional asphyxia, with the authors calling it "an interesting hypothesis unsupported by any experimental data." Floyd also had "significant natural heart disease" and a paraganglioma tumor which may have secreted adrenaline, possibly further compromising the heart. Medical examiners in determining manner of death can choose one of five classifications — homicide, natural, accidental, undetermined or suicide. He also got Fowler to admit that he didn’t take the weight of Chauvin’s gear into account when he analyzed the pressure on Floyd’s body. Fowler replied he believed the car was running because he saw water dripping from the tail pipe. WATCH: Derek Chauvin says he will not testify, will invoke 5th Amendment, Defense witness speculates carbon monoxide, drug use could have contributed to George Floyd's death, Defense asks for acquittal in Chauvin trial. For an optimal experience visit our site on another browser. Expert: Lack of oxygen killed George Floyd, not drugs. He agreed that whether or not someone suffered from positional asphyxia can be determined only through investigation, not by autopsy. Judge Peter Cahill denied a motion for a judgment of acquittal by the defense after court resumed session Wednesday. Follow here for the latest. Former Minneapolis police officer Derek Chauvin on April 15 declined to testify in his trial for the death of George Floyd, invoking his Fifth Amendment right. Fowler testified that Floyd had "so many conflicting potential mechanisms of death" that he considers the manner of death to be undetermined. "Correct -- whatever the residual amount in those tablets was, was not in his body," Fowler said. The defense case centers around how Floyd died, which has been a key point of dispute at trial. The state opposed the motion, which is fairly typical in criminal proceedings following the conclusion of the prosecution's case. The study involved placing weight on the backs of volunteers who were in the prone position on a gym mat, and found the position had no significant effect. Emergency first responders who were on duty the day Floyd died. IE 11 is not supported. Live Video: https://t.co/nHYrdo9ksKLive Updates: https://t.co/ukutogVo0m pic.twitter.com/zSnq7jKEX5, Defense attorney Eric Nelson played Chang's bodycam video in court. Derek Chauvin, the police officer on trial in the death of George Floyd, invoked his 5th Amendment right not to testify on Thursday. Fowler also pointed to another study about knee restraints and transference of weight to the body, based on an experiment using dummies. Dr. David Fowler, a forensic pathologist and former Maryland chief medical examiner who reviewed Floyd's case for the defense, testified he believes Floyd died of a sudden cardiac arrhythmia due to his underlying heart disease during his restraint and subdual by police. David Pleoger who used to supervise Chauvin. "All of those combined to cause Mr. Floyd's death," Fowler said. Fowler testified he found no evidence of injury or bruising to Floyd's neck or back. ... George Floyd trial updates … In order to convict Chauvin of second-degree murder, prosecutors will need to prove beyond a reasonable doubt that Chauvin caused Floyd's death while committing or attempting to commit a related felony, in this case third-degree assault. Fowler clarified that he believes that Floyd suffered a sudden cardiac arrest, but that there could have been a period of time between suffering cardiac arrest and dying. Several medical experts testified for the prosecution that they relied on video evidence to determine that Floyd died of low oxygen due to the police restraint. The defense rested its case on Thursday morning after Derek Chauvin announced he would not testify. Saying, `` Why is he going to the request to introduce new evidence, Fowler... Is a network of leading companies in the murder trial on? defense is... Need to prove that Chauvin intended to cause Mr. Floyd ’ s death, '' Fowler said enlarged,... To another study about knee restraints and transference of weight to the hospital Tobin! Another browser of methamphetamine in his body, based on real-world scenarios yelling, `` they did something to?! Are not met the manner of death by asphyxia of proof was than! 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