George Floyd died from lack of oxygen caused by restraint, lung expert testifies

• Dr Martin Tobin: Mr Floyd died from a low level of oxygen'
• Knee on neck and handcuffs in prone position starved him of air

A leading pulmonary expert has told the Derek Chauvin murder trial that George Floyd was killed by a lack of oxygen because a knee was pressed into his neck while he was held facedown in handcuffs.

As the trial entered its ninth day of testimony, Dr Martin Tobin, a pulmonary and critical care specialist for 40 years, told the jury that the 46-year-old Black man was caught in a vice" between Chauvin and the street as the breath was squeezed out of him.