In a segment about 90 seconds long, Costas paraphrased and quoted extensively from a piece by Fox Sports columnist Jason Whitlock.
After praising the column, Costas said: "In the coming days, Jovan Belcher's actions and their possible connection to football will be analyzed. Who knows? But here, wrote Jason Whitlock, is what I believe. If Jovan Belcher didn't possess a gun, he and Kasandra Perkins would both be alive today."
Belcher shot and killed Perkins, the mother of his 3-month-old daughter, on Saturday morning, then drove to Arrowhead Stadium and committed suicide in the parking lot of the team's practice facility.
The online reaction to Costas' segment was swift, with many people criticizing the broadcaster for expressing his personal views on a program meant for entertainment.