MINNEAPOLIS (WCCO) – The 3-year-old boy who fell into a septic tank in Two Harbors over the weekend has passed away.

Around 7:30 p.m. Sunday, St Louis County Sheriff’s deputies responded to a call of a boy, later identified Mick Johnston, who had fallen into a septic tank.

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Upon arrival, officials were able to pull Johnston from the tank. He was unresponsive and taken to Essentia St. Mary’s Hospital in Duluth. He was listed in critical condition.

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On Tuesday morning, authorities from Essentia St. Mary’s said Johnston had died.

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The exact cause of death is still unknown. However, authorities said it could be from complications caused by the fall.