His office said he died of pneumonia, described as a complication of Alzheimer's disease, a condition he made public in a stirring letter in 1994.

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After a particularly bruising dispute in the New Jersey legislature over his monopoly on the Hudson, he caught a chill and died of pneumonia on Feb. 23, 1815, at the age of 50.

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Stephen Cobbold said 30 of his flock at Acton near Sudbury had died of pneumonia and he could not risk grazing the rest outdoors.

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