Dennis Regan was a resident of Chicago, Illinois who was a neighbor of James Patrick and Catherine O'Leary. It is believed by some that he was an accomplice of in the start of the Great Chicago Fire. Regan lived at 112 De Koven Street. As a witness of the fire, Regan testified that he heard someone outside yell that the O'Leary barn was on fire. Regan claimed that he attempted to warn the O'Learys and put out the fire. There are several holes in Regan's story,the biggest one being that he could not have known of the fire before the O'Learys. With this knowledge, some have assumed that Regan assisted Sullivan, the real culprit, in his attempt to protect the farm animals and exstinguish the fire. Afterwards, it is believed, Sullivan and Regan tried to cover up their involvement.
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