There is video of this incident and it will be looked at by a grand jury.

http://www.nbcnews.com/news/us-news/grand-jury-will-hear-case-tamir-rice-12-year-old-n255036

Quote
A grand jury in Cleveland will decide whether to charge an officer who shot and killed a 12-year-old boy holding a toy gun at a park over the weekend, officials said Monday. Investigators have obtained video evidence of the moment a Cleveland police officer shot Tamir Rice, police chief Calvin Williams said at a news conference Monday. The video is not yet being released, but Cleveland Deputy Chief Ed Tomba said it showed the officer was "very close" when he fired the two shots at the boy's torso. Two officers were involved in the incident, but only one of them fired a gun.

All evidence, including the video, will be considered in an ongoing investigation before it is presented to a grand jury, Williams said. The Cuyahoga County Prosecutor's office, which is overseeing the case, has a policy of presenting all fatal police shootings to a grand jury. "These cases are so serious, so important, that there should be a citizen review," Cuyahoga County Prosecutor Timothy J. McGinty said Monday.


"Facts are stubborn things; and whatever may be our wishes, our inclinations, or the dictates of our passion, they cannot alter the state of facts and evidence". John Adams

"A dishonest man can always be trusted to be dishonest". Captain Jack Sparrow