QUINCY, Mass. — A Massachusetts woman has been charged in the death of her 11-month niece.

Shu Feng Hsu, of Quincy, was held on $200,000 bail after pleading not guilty Thursday to assault and battery on a child causing serious bodily injury in the death of Chloe Chen.

Prosecutors say Hsu was Chloe’s sole caregiver when the child was injured Feb. 15. The baby was taken to the hospital for surgery on her head but went into cardiac arrest during surgery and died two days later.

Police say they heard a series of “thuds” on the audio of the home surveillance system when Hsu was alone in a room with the child.

A defense attorney says his client called 911 and has cooperated with investigators.

The death remains under investigation.

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