Officials say a witness who testified in the murder trial of former Dallas police officer Amber Guyger was shot to death Friday night. Joshua Brown's testimony helped prosecutors piece together what happened when Guyger shot her neighbor, Botham Jean, ultimately leading to Guyger's conviction. CBS News correspondent Omar Villafranca joined CBSN AM with the latest.

Code: Travel6. It is required to enter a promotional code. The promotion applies to a certain group of goods. The promotion is available to all shop customers. The promotion is available without any restrictions on the amount of the order.

More videos