CLEVELAND - The city of Cleveland is asking Tamir Rice's estate to pay $500 for his ambulance ride and medical services he received after he was shot by a police officer.

The city requested the money as the boy's "last dying expense" in a creditor's claim filed Wednesday in Cuyahoga County Probate Court. The claim states the money is overdue.

A family attorney for the estate called the claim callous and insensitive, as the 12-year-old was killed by the city's own police officers.

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Rice, who is black, was shot by a white police officer in November 2014 outside a recreation center. He had an airsoft pistol that police say resembled a real gun.

CBS Affiliate WOIO reports the attorney for Samaria Rice, Tamir's mother, released the following statement:

"The callousness, insensitivity, and poor judgment required for the city to send a bill -- its own police officers having slain 12-year-old Tamir -- is breathtaking. This adds insult to homicide."

The city's police union president says the claim is unconscionable.

A city spokesman declined comment citing ongoing litigation.