(CNN) -- Grief over a Kentucky officer's death is giving way to rage and anxiety as police believe someone set up a trap just to kill their colleague or another driver.

Bardstown Police Officer Jason Ellis was driving home from work around 2 a.m. Saturday when he noticed some debris on the road, Kentucky State Police Trooper Norman Chaffins told CNN.

When Ellis got out of his car to remove the debris, he was shot multiple times.

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Bardstown Police Chief Rick McCubbin promised to avenge his officer's death.

"It's an eye for an eye. You kill one of my guys, I'm not going to rest until I have you in cuffs or on the front side of a weapon. And I mean that," he said.