A federal jury has convicted a former Miami-Dade Police homicide detective from Tamarac for lying under oath during a 2022 court hearing, federal prosecutors announced Tuesday.
Keenan Johnson, 36, of Tamarac, was found guilty of three counts of perjury stemming from false testimony he gave during an evidentiary hearing before U.S. District Court Chief Judge Cecilia Altonaga in Miami on April 4, 2022.
Johnson now faces up to five years in federal prison on each count. His sentencing is scheduled for October 3, 2025.
According to evidence presented during the five-day trial, Johnson took the stand during a hearing on a motion to suppress evidence and repeatedly denied having contact with a key witness.
He testified that he had never spoken to the witness by phone, never received text messages from the witness, and did not use a specific telephone number that was linked to the witness, prosecutors said.
But phone records and other evidence told a different story, according to the U.S. Department of Justice.
Investigators later discovered Johnson had used the telephone number in question for more than four years, had indeed spoken with the witness—including a call lasting over ten minutes the night before the suppression hearing—and had even included the number on police flyers.
Johnson deleted the number from his phone after the hearing, according to the government.
The inconsistencies prompted Chief Judge Altonaga to ask prosecutors to investigate further, ultimately leading to Johnson’s indictment on July 31, 2024, prosecutors said.
The case was investigated by the FBI’s Miami Field Office and the Miami-Dade County Office of the Inspector General. It is being prosecuted by Assistant U.S. Attorney E. Jackson Boggs Jr., who was specially appointed to handle the case.
Johnson’s conviction marks a rare instance in which a law enforcement officer has been held criminally accountable for lying under oath in federal court.
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