<p>Two witnesses who saw banking executive Russell Long fatally punched on the Magnificent Mile in 2023 testified Monday that the shocking attack was unprovoked.</p><p>Eric Arrigo, 28, and Andrew Meza, 29, who were roommates at the time, testified that they saw Henry Graham run up to Long and punch him in the back of his head as Long walked near Michigan Avenue and Ontario Street on a sunny afternoon on June 29, 2023.</p><p>Long died of brain injuries at Northwestern Memorial Hospital 13 days later. Graham, 52, is charged with two counts of first-degree murder.</p><p>The Chicago Sun-Times detailed Graham's case last year in <a class="Link" href="https://chicago.suntimes.com/the-watchdogs/chicago-downtown-attacks-mental-health-system" target="_blank" >“Failure to treat, failure to protect,”</a> a series of stories about failures on the part of government and the justice and mental health systems in addressing the problem of violent people with untreated severe mental illness who cycle in and out of jails, prisons and hospitals.</p><p>In his opening statement, law student Jake Balderas, assisting Assistant Cook County Public Defender Celeste Addyman, tipped the defense strategy in acknowledging that "it's no secret that Mr. Graham punched Mr.