NEW YORK (AP) — A prosecutor says a baby sitter shook a 3-month-old infant so violently that he suffered a massive brain injury and died at a New York City hospital.

Addison Reinoso-Xoyatla’s death was initially linked to a sluggish medical response in the aftermath of last month’s blizzard.

But Queens District Attorney Richard A. Brown said in a statement Friday that investigators expect evidence to show the death was caused by severe brain damage, not by delays in reaching him on Dec. 29. The baby born to an Ecuadorean mother and Mexican father died Jan. 4.

Ana Delarosa was charged with second-degree murder and endangering the welfare of a child.

The 26-year-old’s phone number was unlisted. A message left for a possible relative was not returned Saturday night.

(Copyright 2011 by The Associated Press. All Rights Reserved.)