HK-50i was an assassin Droid built on Telos. He was programmed to hunt down Jedi. He tracked Jedi Lonna Vash to Korriban and killed her. When he returned to Telos to tell his master the news, he found HK-47. He respected him and served him. He followed HK-47 for many years, killing 5,900 imperials. His last known mission was to kill a Warlord on the planet Sleheyron.