By Pat Loeb

PHILADELPHIA (CBS) — The man convicted last year of the first-degree murder of Philadelphia police officer Moses Walker Jr. in 2012 was sentenced today to life in prison.

The sentence of Rafael Jones followed a dramatic and emotional hearing in which one of Walker’s fellow officers was reduced to tears as he testified that he felt he let Walker down because he was unable to save Walker’s life after being sent to the scene of the shooting.

(Officer Moses Walker.  Phila. PD photo)

(Officer Moses Walker. Phila. PD photo)

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Walker was gunned down just after leaving work in the early morning of August 18th, 2012, during an attempted robbery.

Today, Walker’s mother testified that her life has been a living hell since that day. And she told Jones directly, “I hope you rot in hell.”

But perhaps the most astounding moment was when Jones asked to address the court and demanded to know the judge’s statutory authority to impose a sentence.

The judge then pronounced the life sentence, plus 23 to 47 years on three other charges.