[Warning: This video contains graphic images..]

Manuel Ramos, a police officer from Fullerton, California, has been charged with second degree murder for allegedly beating a mentally-ill homeless person to death last year. His co-worker, Officer Jay Cicinelli, faces charges of involuntary manslaughter and excessive use of force. This video from a surveillance camera shows Kelly Thomas, the victim, pleading for his life while the officers beat him on the street.

Via:

The case has been particularly emotional for Ron Thomas, who has been forced to watch the video of his son's beating and listen to the heartbreaking pleas. At one point, Kelly Thomas cries out, "Dad, they are killing me!"

In an earlier interview, Ron Thomas said the hardest part of the video and audio "is the sounds of my son calling out."

Rackauckas presented the case himself, playing a dramatic, never-before-seen video that showed a shirtless Thomas being pummeled and held down by Fullerton police officers.

Rackauckas said Ramos "turned a routine encounter into a brutal beating death" while Cicinelli "assisted in the killing of Kelly Thomas" by "smashing his face" with the butt of a Taser stun gun and applying his own weight on Thomas' torso.

A coroner's pathologist said Thomas died of chest compression and blood from his facial wounds.

Thomas, who was a diagnosed schizophrenic, sustained neck and head injuries during his encounter with Fullerton police. He was taken to UCI Medical Center where he spent the last days of his life in a coma, until his parents made the decision to remove him from life support.