Irwin Constable, 20, Rajae Heslop, 29, pulled up on a stolen moped and shot 38-year-old Leon Maxwell dead in north London on May 1, 2018.
In 2003 he was jailed for life and ordered to serve a minimum of 12 years, for murdering Irish traveller Patrick Fitzharris over a £75 cannabis deal. Constable and Heslop were convicted of murder along with Saharded Hassan, 28, who organised the hit.
Judge Rebecca Poulet QC adjourned the sentence until March 26.
