Editor's note: Some images or material discussed during the trial will be disturbing to many viewers. Derek Chauvin's attorneys on Wednesday called to the stand a retired Maryland medical examiner who testified that George Floyd's enlarged heart, a narrowed coronary artery and drug use — in addition to the police restraint — were factors in his death. Proceedings were expected to continue around 9:15 a.m. Read the latest reporting: https://www.mprnews.org/story/2021/04...