After Chief Boden was framed for assault charges on a temporary neighbour.

Season 4 Episode 7 "Sharp Elbows"
Boden could face criminal assault charges following an incident with his neighbor which leads to Voight helping out. Meanwhile, tensions continue with Captain Patterson which leads to Severide's father obtaining information that could bring Patterson down. Also, Chili and Borelli continue their romance, Otis asks out Brett to the Chicago Fire Department gala and Cruz helps out an old friend.

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