A top medical expert told a jury George Floyd died from a lack of oxygen that damaged his brain and caused his heart to stop. Dr. Martin Tobin said Floyd could not take in enough oxygen while he was pinned on his stomach with his hands handcuffed behind his back for more than nine minutes. Jamie Yuccas reports. Each weekday morning, "CBS This Morning" co-hosts Gayle King, Anthony Mason and Tony Dokoupil deliver two hours of original reporting, breaking news and top-level newsmaker interviews in an engaging and informative format that challenges the norm in network morning news programs. Subscribe to “CBS This Morning” on YouTube: https://www.youtube.com/user/CBSThisMorning Watch CBSN live: http://cbsn.ws/1PlLpZ7c​ Download the CBS News app: http://cbsn.ws/1Xb1WC8​ Follow "CBS This Morning" on Instagram: http://bit.ly/1Q7NGnY Like "CBS This Morning" on Facebook: http://on.fb.me/1LhtdvI Follow "CBS This Morning" on Twitter: http://bit.ly/1Xj5W3p Subscribe to our newsletter: http://cbsn.ws/1RqHw7T​ Try Paramount+ free: https://bit.ly/2OiW1kZ For video licensing inquiries, contact: [email protected]