An initial medical examiner report just months later found the cause of death was due "to being restrained in a prone position" by police officers.
Last Friday, a Cuyahoga County grand jury cleared the officers of any criminal wrongdoing as well as offering a new, second autopsy report that instead found it more likely Anderson died as a result of a previous heart condition or medication.
The family insists Anderson had no history of heart problems and was not on medication.
"This is a cover-up to keep the police out of jail," said Cassandra Johnson, Tanisha's mother.
Her uncle says the family is now considering new legal action against both the Cleveland Police Department and the City of Cleveland.
"If this was Frank Jackson's daughter or a judge's daughter or son — something would have been done a long time ago," said Michael Anderson.
Tanisha's sister says "it was a low blow to the family" and says "we know they were guilty".