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Five years after Eric Garner’s death in police custody ignited a national outcry, a police administrative judge recommended on Friday that the officer who placed him in a chokehold during the botched arrest should be fired.

The finding sets in motion the final stage of a long legal and political battle over the fate of the officer, Daniel Pantaleo, who has become for many critics of the New York Police Department an emblem of what they see as overly aggressive policing in black and Hispanic neighborhoods.

How to handle Officer Pantaleo has been a political minefield for both Police Commissioner James P. O’Neill — who now must decide whether to fire him and incur the wrath of police unions — and Mayor Bill de Blasio, who for years has expressed solidarity with the Garner family while avoiding saying whether Officer Pantaleo should remain on the force.

For the police, Mr. Garner’s death was a watershed moment, forcing a reckoning over how the department engaged with its residents. Across the country, his last words — “I can’t breathe” — became a battle cry for the Black Lives Matter movement, and led to sweeping changes in use-of-force policies.