The video starts off showing Chester Jackson on the ground, speaking with three officers when one enters his cell.
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Body cam video shows the officer picking up the handcuffed Jackson, and then throwing him onto a metal slate
The inmate hits his right arm on the metal slate, then hits his head on the metal toilet.
Police initially said the inmate fell.
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The inmate is on life support, but is said to be improving.
The officer has been placed on administrative leave.
The Texas Rangers are investigating.