  We report the period, eccentricity, and mass determination for the TESS
single-transit event candidate TOI-222, which displayed a single 3000 ppm
transit in the TESS two-minute cadence data from Sector 2. We determine the
orbital period via radial velocity measurements (P=33.9,days), which allowed
for ground-based photometric detection of two subsequent transits. Our data
show that the companion to TOI-222 is a low mass star, with a radius of
$0.18_{-0.10}^{+0.39}$ Rsun and a mass of $0.23\pm0.01$ Msun. This discovery
showcases the ability to efficiently discover long-period systems from TESS
single transit events using a combination of radial velocity monitoring coupled
with high precision ground-based photometry.
