the ahmaud arbery murder trial got off to an emotional start today as his mother saw graphic video of her son being chased down and killed by three white men. cbs omar villafranca is at the courthouse in brunswick, georgia, with more on today s opening statements. reporter: wanda cooper jones sobbed in the courtroom today. look how far mr. arbery is. reporter: for the first time, she watched the video that showed her son, ahmaud arbery, being chased, shot, and killed. the now-infamous video was part of the prosecution s opening statements in the murder trial of travis and gregory mcmichael, and william roddie bryan. prosecutors say the mcmichaels assumed the worst when they spotted arbery walking out of an open construction site while jogging in the neighborhood. all three of these defendants did everything they did based on assumptions, and they made decisions in their driveways, based on those assumptions that