Muños-Muños, 23, was driving drunk when his vehicle struck Sgt. Polk's truck on May 19, 2013 as the sergeant was on his way home from an extra job.
Sgt. Polk's 11 year-old son, Christian, read the victim's impact statement at the sentencing.
Muños-Muños had been previously arrested for Driving While Intoxicated in 2012.
Sgt. Polk was a 16 year veteran of the Harris County Sheriff's Office.