At the age of 7, Cynthia Morgan started composing songs and at the age of 17 she recorded her debut single which featured General Pype “Dutty Stepping”. In 2008, she moved to Lagos to further her music career. she calls herself “Killa Marshal” which her Ego on stage.

On 22 August 2013, Cynthia Morgan signed a recording contract with Northside Entertainment Inc. owned by Jude ‘Engees’ Okoye. Few months later, she released two chart-topping singles “Don’t Break My Heart” and “Lead Me On” which got positive reviews from fans; the latter went on to be nominated for “Best Reggae/Dancehall Single” at The Headies 2014

On 23 May 2020, Cynthia Morgan who has not released songs for years in an Instagram Live session revealed she lost her stage name, “Cynthia Morgan”, her VEVO account, royalties, Instagram account and other things due to the contract she signed with Jude Okoye. She revealed that she became depressed after her fallout with Jude Okoye of Northside Entertainment but did not go public about her issues. Fans went on to donate to a GoFundMe account set up for her and even Afrobeats Superstar Davido weighed in and asked her to call him up for a collaboration.