Vinson was an advisor to Marlo Stanfield, acting also as his personal bank, and also runs a rim shop where Marlo often operates.
During season three, he gives Stanfield advice on how to deal with his rival Avon Barksdale when Avon is released from prison. He continues to counsel Stanfield once he becomes embroiled in a turf war with Barksdale. He also acts as a liaison between Stanfield and Proposition Joe as Joe attempts to negotiate an end to the turf war. It is Vinson who identifies Omar Little to Brother Mouzone on Mouzone's return to Baltimore seeking revenge.
In season four, Marlo continues to use Vinson's rim shop as an occasional meeting place, though Vinson does not appear.
Vinson appears in season 5 in the episode "React Quotes" at a meeting at the rim shop berating Monk for wearing a bulletproof vest. At the end of the series finale, Vinson is robbed and shot in the knee by Michael Lee.