We present the overall design, fabrication status, and key science drivers of the next-generation W. M. Keck Observatory Adaptive Optics (AO) near-infrared (0.8 - 2.45 micron) integral field spectrograph (IFS) and imaging camera, named Liger. The Liger team has completed its Final Design Phase and entered the Fabrication phase. Liger offers excellent sensitivity with significant improvements in wavelength coverage enabling a broad range of new science. Liger will provide unique capabilities with higher resolution spectroscopy (R=4000 - 10,000), extending to bluer wavelengths (< 1 micron), and a larger field of view than other AO-fed IFS. We will present the status of the program, fabrication efforts, and focus on the most challenging aspects of the design and execution of the instrument.
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