A boozed-up driver who slammed into a city ambulance last week now faces murder charges after one of the emergency medical technicians he hit died yesterday, police said.

Andre Lahens, a devoted father of two who had been set to retire after 24 years as an EMT, died at noon at Brookdale Hospital, where he had lain unconscious and hooked to a respirator for the past week.

Lahens, 47, and co-worker Michael Steffans were thrown from their ambulance when a van driven by Sylvester Valle blindsided them at Fountain and Wortman avenues in Brooklyn last Thursday, authorities said.

They had been responding to a call of a shot cop. Lahens had suffered severe head and stomach injuries in the violent collision.

Valle, 29, allegedly was speeding and had zoomed through a stop sign when he hit the ambulance, which was running with its lights and sirens as it rushed to what turned out to be a false alarm.