Newkirk appeared on several hip hop records including the remix to "Say No Go" by De La Soul and Stetsasonic's "Talking All That Jazz".
His Southmore album entitled Between Love & Lust was recorded in 1992, but before it could be released, the DefJam label was sold and the project never came out.
In 2021, Newkirk renamed the project Nostalgia and released the 1992 recordings, making them available on all streaming platforms.
Together they also composed the score and theme song for the podcast Mogul: The Life & Death of Chris Lighty for Gimlet Media.
His death was announced via his sister, Olivia Harris, who wrote that he died suddenly on November 25, 2022, at the age of 55.