Gianmarco Vecellio (1933-1968) was a Marcano crime family associate and blackmailer who lived in New Orleans during the 1960s. In 1968, he was sent to meet with Democratic city councilman A. Oliver Tyrell at a car park to collect a blackmail payment from him, but Lincoln Clay tailed Vecellio to the meeting. Clay then threw a grenade at the meeting, killing Vecellio and Tyrell instantly.