We report on the identification of the lens responsible for microlensing event MACHO-LMC-20 .
As part of a Spitzer /IRAC program conducting mid-infrared follow-up of the MACHO Large Magellanic Cloud microlensing fields , we discovered a significant flux excess at the position of the source star for this event .
These data , in combination with high resolution near-infrared Magellan /PANIC data has allowed us to classify the lens as an early M dwarf in the thick disk of the Milky Way , at a distance of \sim 2 kpc .
This is only the second microlens to have been identified , the first also being a M dwarf star in the disk .
Together , these two events are still consistent with the expected frequency of nearby stars in the Milky Way thin and thick disks acting as lenses .