Noam Pitlik, who played Officer Swanhauser in the first season passed away in 1999.
However, in addition to Demond Wilson, Lynn Hamilton and Hal Williams, the following cast members of Sanford and Son are still with us:
Pat Morita (Ah Chew)
Gregory Sierra (Julio Fuentes)
Howard Platt (Officer Hopkins "Hoppy")
I could not find any verification if the actors/actresses who played Uncle Woodrow, Janet Lawson and Roger Lawson are still living.