Jarrett Garner (per his Twitter): https://twitter.com/_Jarett2fo/statu...deE0XBK_vDoNww
He entered the portal in January (and didn't participate in the spring so far as I know) so this isn't really a surprise.
He had great speed but questionable hands. Could be looking for playing time if he was getting passed by some of the younger guys. Could have been really attached to the old staff and wanted a fresh start. He was a redshirt junior and may have graduated. This list is not exhaustive, but there are a number of reasons he might have left for ECU.