Here is John Lewis in 1850:

1850 Sonoma Co, California
Dwelling 115, Family 116
Lewis John 33 M Farmer 15,000 Ohio
Lewis Catherine 32 F Ohio
Lewis Sarah 13 F Ohio
Lewis Maria 8 F Ohio
Lewis George 6 M Missouri
Lewis Sophia 3 F California
Wardlow Wm. 6 M Missouri
Miller Elisha 6 M Iowa

From an anonymous article in the Alta California, 4 Oct 1859 (as reported by Robert Parmalee "Pioneer Sonoma"), "Of those who came [to Sonoma] in 1846, John Lewis is dead."