Timothy Loehmann, the officer who shot the 12-year-old in 2014, was recently hired by a police force in rural Pennsylvania.
Tamir's mother is outraged, saying "I'm devastated and disgusted by it...It's pitiful and pathetic. It shows that the system is unfair and unjust."
The denial is seen as the likely end of Loehmann's attempts at being reinstated on the police force after being fired for lying on his job application.
"Personally I don't understand how you sleep at night. I never gave you permission to raise nothing. [A]long with the united states, you robbed me for the death of my son," Samaria Rice wrote in an Instagram post addressed to King.
Attorneys for the family wrote in a letter: "The truth is this case is tragically simple. Tamir Rice was a boy. On November 22, 2014, he was doing something many boys enjoy: playing with a toy gun in a park near his house."
The Dallas district apologized, saying "it is never our intent to censor anyone's freedom of speech."
Footage shows Officer Peter Casuccio telling boys how close they were to being shot while playing with realistic-looking gun.
The employee said he didn't know the officer was involved in the shooting at the time and that he's made jokes to other officers as well.
"It made me feel scared, said the girl," Honestie Hodges, about the incident.
Ten recent deaths caused by police show a correlation between the size of the award and culpability.
The black teenager was shot dead by a white officer after allegedly pulling a replica gun.
Akai Gurley was shot in November 2014; officer Peter Liang says the gun went off by accident.
The new measure requires certain BB and pellet guns to come with bright markings.
The mayor called for "the complete and total reform of the system and policing culture."
The hashtag #NoJusticeNoLeBron trended on Twitter Tuesday.
The 12-year-old boy was killed in November 2014 in a Cleveland park.
Rice, 12, was killed by officer Timothy Loehmann while playing with a fake gun in a Cleveland park.
Tamir Rice died in November 2014 after being shot at a park in Cleveland.
On Friday, the family's attorneys released the reports written by former senior California police officials.
A retired FBI agent and a Denver prosecutor said Timothy Loehmann's actions were justified.
95 percent of elected prosecutors are white—and 79 percent are white men—a study says.
Cleveland police officers fatally shot Tamir Rice, 12, last November.
In 2012, a deputy chief determined that Cleveland police officer Tim Loehmann "could not follow simple directions."