A four-year-old boy was killed in front of his father after a eucalyptus branch fell on him in a California park — with his family now filing a wrongful death lawsuit alleging the trees have been doomed for decades.

Ronan Kerr was struck on the head by a “large” piece of a eucalyptus tree while playing in Villa La Jolla Park in San Diego in June, according to a GoFundMe organized for his family.

He was beside his father, Cathal, and his 7-year-old brother, Charles, when the 34-foot branch plummeted 60 feet down from the tree, according to a wrongful death lawsuit obtained by the San Diego Union-Tribune.

Cathal Kerr tried to swoop in to grab both the boys, but was unable to catch Ronan in time. The branch then struck little Ronan and his father, according to the lawsuit filed on Tuesday

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