Live Updates: Derek Chauvin trial continues after experts said Floyd died of lack of oxygen

Testimony is set to resume Friday in the trial of Derek Chauvin, the fired Minneapolis officer charged in George Floyd's death, after two medical experts testified that Floyd died of oxygen deprivation — not drugs, as the defense has suggested.

Floyd died from a low level of oxygen that damaged his brain and caused his heart to stop, testified Dr. Martin Tobin, a renowned expert who specializes in pulmonology and critical care. Tobin said the weight from officers forcing Floyd's left wrist high into his chest and an officer's knee on his left side, combined with pressure from the street on the other side of Floyd's body, acted like a "vise" and constricted his left lung from expanding. At the same time, Chauvin's knee on Floyd's neck was at various points putting pressure on Floyd's hypopharynx, a small area at the bottom part of the throat, further compromising his breathing, Tobin said.  Tobin discounted the defense's suggestion that Floyd's underlying heart conditions and fentanyl use contributed to his death.