Homeless Man Kelly Thomas' Beating Death by Cops Caught on Tape

Mentally ill homeless man heard pleading on tape.

A tape showing two cops beating a mentally ill homeless man to death was released during a preliminary hearing this past weekend, according to CNN.

The beating death of Kelly Thomas has prompted the FBI to investigate if the man's civil rights were violated.

Manuel Ramos and Jay Cicinelli, two Fullerton, California cops, have been charged with involuntary manslaughter and felony use of excessive force.

Both cops have plead not guilty despite the video showing incriminating evidence against them.

In the video, cops are shown giving Thomas a warning to get on the ground. A few seconds later, officers began pummeling Thomas who was heard saying, " OK, I'm sorry dude, I'm sorry!"

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The city coroner has ruled the death a homicide. Four other officers are also implicated in the attack of Thomas. All six officers have been placed on paid leave.

You can view the video below: