Ellis was shot and killed on May 25, 2013 in an ambush on his way home from work.
At the ceremony, Bardstown Police Chief Rick McCubbin said, "They say every 57 hours one of us dies in the line of duty. We don’t know where that clock is gonna chime on that 57th our, but almost one year ago, it chimed in Bardstown."
Nearly a year later, Ellis’ murder has not been solved.
The name of McCracken County Sheriff’s Deputy Chad Shaw was also added to the memorial.
Shaw died of a heart attack in 2013 shortly after making an arrest.
Seven other names of officers killed in the line of duty between 1908 and 2012 were also added to the memorial.
The delay was due to a requirement that the names first be placed on the National Law Enforcement Memorial.
The new names bring the total on the Kentucky memorial to 518.
Governor Steve Beshear said, "If you stop to ponder the stories behind those 518 names, it gets a little overwhelming."