We report CDF results on the B-_c meson in Run II.  The B-_c
meson has been observed in semileptonic decays, B-_c --> J/psi l- nu X,
where l = e, mu at a significance greater than 5 sigma in both channels.
The B-_c --> J/psi l- nu X observations have resulted in measurements of
the relative production times branching ratio with respect to B- --> J/psi
K- decays and a precise determination of the lifetime of the B-_c:
tau(B-_c) = 0.474+0.073_-0.066 +/- 0.033 ps.  Also, an observation of
B-_c --> J/psi pi+- decays at a significance exceeding 6 sigma results in a
precise determination of the mass of the B-_c: M(B-_c) = 6275.2 +/- 4.3
+/- 2.3 MeV/c2.