  While the vast majority of multiple-planet systems have their orbital angular
momentum axes aligned with the spin axis of their host star, Kepler-56 is an
exception: its two transiting planets are coplanar yet misaligned by at least
40 degrees with respect to their host star. Additional follow-up observations
of Kepler-56 suggest the presence of a massive, non-transiting companion that
may help explain this misalignment. We model the transit data along with
Keck/HIRES and HARPS-N radial velocity data to update the masses of the two
transiting planets and infer the physical properties of the third,
non-transiting planet. We employ a Markov Chain Monte Carlo sampler to
calculate the best-fitting orbital parameters and their uncertainties for each
planet. We find the outer planet has a period of 1002 $\pm$ 5 days and minimum
mass of 5.61 $\pm$ 0.38 Jupiter masses. We also place a 95% upper limit of 0.80
m/s/yr on long-term trends caused by additional, more distant companions.
