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Silletti stalks his ex-girlfriend after she dumps him.Chief Jerry's wife gradually deteriorates from Alzheimer's, and he is forced to seek help from his estranged son before placing her in a long-term care facility.
Gavin and his wife, Janet are separated and, from across the street, he sees her begin to date again and plans to get her back and prevent her from taking his children and leaving the state.
Tommy attacks Johnny at their father's 83rd birthday dinner and then fight it out in the street. The violence of the act is contrasted with his post-coital attitude and the show's suggestion that she enjoyed it. Shea, still smarting from getting conned, is becoming testy with everyone on the crew and slowly spiraling down.
Mike Silletti (now no longer referred to as "Probie") begins a sexual relationship with his male roommate (receiving oral sex), and Tommy falls back into things with Sheila.
In the final scene of the season finale, Tommy shows up at his wife's house to find her and his children missing, along with everything in the house.
While consuming a bottle of vodka he finds in a cupboard, he uses a baseball bat to destroy anything that's left in the house. It began with Tommy at a new firehouse on Staten Island and his replacement at 62 Truck, Sully, becoming everyone's favorite.
Sheila has a miscarriage, but lies about it to keep Tommy near.