(CNN) — An “outraged” Florida prosecutor fired back on Monday at the family of Trayvon Martin, describing as “outright lies” their account that he and a local police chief met and decided not to follow a detective’s advice and arrest the teenager’s killer.

Earlier in the day, the Martin family delivered a letter to the U.S. Justice Department through attorney Benjamin Crump’s office requesting a federal investigation of the decision not to arrest George Zimmerman after the fatal February 26 shooting.

The 28-year-old neighborhood watch volunteer has said he killed Martin in self-defense, saying the teen punched him and slammed his head into a sidewalk before the shooting, according to family members and police.

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