A deranged Minnesota man allegedly bludgeoned his female co-worker to death with a sledgehammer — and told police he had been plotting the ruthless attack for some time.

David Bruce Delong, 40, was arrested and charged with second-degree intentional murder after repeatedly clubbing 20-year-old Amber Czech with the mallet at Advanced Process Technologies in Cokato around 6 a.m. Monday, according to the Wright County Attorney’s Office and local reports.

Police said the alleged unhinged attacker was captured on surveillance footage leaving his workstation inside the food and dairy machinery plant and approaching Czech before grabbing her sledgehammer and bashing her in the head.

The unsuspecting victim, reportedly a welder, fell to the cement floor as Delong forcefully struck her four mor

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