At Chauvin trial, expert says Floyd died from ‘low level of oxygen’ after officer had knee on neck

Testimony in the trial of former Minneapolis police officer Derek Chauvin continued Thursday with a breathing expert saying that George Floyd died due to a “low level of oxygen” that caused brain damage, rebuking the defense’s argument that drugs contributed to Floyd’s death. Martin Tobin, a pulmonologist and national breathing expert from Hines, Ill., offered testimony as an unpaid witness that Chauvin’s knee was on Floyd’s neck for the “vast majority of the time” and that the pain from the pressure applied by the officer to Floyd was comparable to...