Marshall began his radio career in the early 1980s, hosting shows on various stations before joining Downtown Radio in 1991. He quickly became a listener favorite, known for his vast knowledge of music, witty banter, and ability to connect with his audience. Over the years, Marshall had a number of popular shows, including the afternoon "Dougie's Music Factory," the evening "Dougie's Jukebox," and the weekend "Dougie's Sunday Soul."
In addition to his radio career, Marshall was also a successful businessman and entrepreneur. He owned several pubs and restaurants in Northern Ireland and was heavily involved in the local music scene. He was known for his generosity and willingness to support local artists and musicians.
Marshall's passing has left a void in the Northern Irish radio landscape and he will be deeply missed by his family, friends, colleagues, and listeners alike.