Cathy Guild, 47, of Roxbury held a sign and wore a hoodie in memory of Trayvon Martin during a protest by the Occupy movement in Dudley Square Plaza in Roxbury after George Zimmerman was acquitted in Martin’s killing in Florida.  who shot and killed teenager Trayvon Martin in 2012. (Yoon S. Byun/Globe Staff) Slug: 15trayvonreax Reporter: jeremy fox LOID: 6.1.4048750613