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FLUSHING, QUEENS (PIX11) – It was a beautiful Sunday afternoon in Kissena Park when witnesses say a pregnant woman was sitting on a park bench on the phone.

Suddenly a huge tree behind her came crashing down.

Salvatore Delligatti’s wife was walking their dog just a few feet away.

“The dog stopped and my wife saw the tree fall on the woman sitting on the bench,” Delligatti told PIX 11. “There was blood everywhere. The woman was in pretty bad shape.”

The injured woman, identified by the Daily News as 30-year-old Yingyi Li,  was rushed to New York Hospital Flushing in cardiac arrest. Li was pronounced dead minutes later.

Witnesses were so shaken, many in this crowded park couldn’t believe what happened.

“First I hear a big noise, then I see the woman all bloody,” John Skandul said. “People were trying to help. All bloody. She was in bad shape.”

As police and the Kissena parks supervisor tried to figure out what made this large, seemingly sturdy tree, possibly an oak, fall on a still, almost windless afternoon, many pointed out numerous other trees limbs that had fallen nearby, but not entire trees.

“There have been 12 injuries from fallen trees in the last eight weeks,” Geoff Croft, president of NYC Parks Advocates told PIX11. “The city must learn to maintain and inspect their trees so avoid a tragedy like this.”