On May 21, 2014, 25-year-old Shannon Cannon Richardson, a Black man from Boston, was shot and killed while walking on Dudley Street in Dorchester. He staggered into a nearby store on Dudley Street and collapsed; police who responded to a shots-fired call found him and he was later pronounced dead at Boston Medical Center.

Witnesses described the shooter as a man with long dreadlocks and specific clothing. Officers on patrol reported seeing a man matching that description running near the scene clutching his waistband; that man ran into the same store where Richardson lay wounded. He was identified as 25-year-old Peter Carvalho of Dorchester and was arrested and arraigned on a murder charge, held without bail. Prosecutors contended Carvalho had followed and shot Richardson, but a Suffolk Superior Court jury later acquitted Carvalho after rejecting the prosecution’s theory.

Anyone who knew Shannon, saw him that afternoon, or has information about what happened is asked to come forward.