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In his "Tip of the Day" segment last night, Bill O'Reilly said it is "despicable" for George Zimmerman to attempt to sell the handgun he used to kill Trayvon Martin.

An ad for the weapon was posted and later pulled from an online gun auction website Thursday.

After it was halted by a second website, the auction for the gun was back up on a third site Friday morning.

"You simply do not profit from a tragedy," O'Reilly stated. "''Factor Tip of the Day': Sometimes you have to make judgments about people's behavior."

Zimmerman shot and killed 17-year-old Martin in 2012. He was later acquitted in Martin's death, sparking protests and a national debate about race relations.

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