Walker acted in television shows, on
The Cosby Show from 1988 to 1991 portraying Cliff Huxtable's physician friend, Dr. James Harmon. He guest-starred in episodes of
The Pretender (1999),
The Sentinel (1997), and
Law & Order: Special Victims Unit (2004). He also played a bit part in several movies, including
Crocodile Dundee (1986). His most significant role was in the 1994–95 show
Earth 2, where he appeared in nearly every episode as
Yale, a
cybernetic advisor to Devon Adair (
Debrah Farentino) and tutor to her son, Uly. His final role was in the 2005 movie ''
Get Rich or Die Tryin'''. Outside of film and television Walker was also a
Broadway actor, acting in
August Wilson's
Two Trains Running. Toward the end of his life, he endeavored to found a school/workshops for Caribbean actors in New York to succeed in the American film and television markets. ==Death==