George Floyd died of a lack of oxygen from the way he was held down by police, a retired forensic pathologist testified Friday at former Officer Derek Chauvin's murder trial. The testimony of Lindsey Thomas, who retired in 2017 from the Hennepin County Medical Examiner's office in Minneapolis, bolstered testimony by other experts on Thursday that rejected the defense theory that Floyd's drug use and underlying health problems killed him. Thomas did not work on Floyd's case, but agreed with the findings of her former colleague, Hennepin County Medical Examiner Andrew Baker, that Floyd died from cardiopulmonary arrest complicated by law enforcement subdual, restraint and neck compression. But she went further in saying "the primary mechanism of death is asphyxia, or low oxygen." "This is a death where both the heart and lungs stopped working. The point is, it's due to law enforcement subdual restraint and compression," Thomas said. "The activities of the law enforcement officers resulted in Mr. Floyd's death." Her testimony came a day after other medical experts also said Floyd died of a lack of oxygen. Subscribe to our YouTube channel: https://bit.ly/2TwO8Gm Bloomberg Quicktake brings you live global news and original shows spanning business, technology, politics and culture. Make sense of the stories changing your business and your world. To watch complete coverage on Bloomberg Quicktake 24/7, visit http://www.bloomberg.com/qt/live, or watch on Apple TV, Roku, Samsung Smart TV, Fire TV and Android TV on the Bloomberg app. Have a story to tell? Fill out this survey for a chance to have it featured on Bloomberg Quicktake: https://cor.us/surveys/27AF30 Connect with us on… YouTube: https://www.youtube.com/user/Bloomberg Breaking News on YouTube: https://www.youtube.com/c/BloombergQuickTakeNews Twitter: https://twitter.com/quicktake Facebook: https://www.facebook.com/quicktake Instagram: https://www.instagram.com/quicktake