Kim gave birth to their son, Joey (named after Jimmy's best friend, Joe Lombardo). Jimmy had an affair with Kim's sister, Melanie, and Kim filed for divorce. They shared custody of Joey, both seeing each other every day as they worked at the same time in the same firehouse. Jimmy often competed for Kim's affection against her work partner, Bobby Caffey - she was still the love of his life despite the divorce. Jimmy had been gambling for a while and was soon in debt, causing his child support payments to Kim and Joey to be late. He'd tried borrowing money from his family - but his parents (who pay Joey's school fees) were organizing a trip for his father's birthday, and brother Tommy had already lent Jimmy money in the past. He has another brother, Jack, who lives in Pittsburgh. Jimmy ended up having to give up his car to pay off his debts, an act which Joey witnessed. Jimmy had to walk Joey home in the cold. After this, he vowed to become a better father. At the end of the first season, Jimmy was shot by an ex-fireman who had gone slightly insane, and spent many weeks in a hospital. He returned to work too early, trying to regain past glories, but later realized he should not return until he was completely ready. Jimmy (thanks to Joey) met a police officer, Brooke (from another precinct) in a supermarket and they soon fell in love. After a whirlwind romance, Jimmy proposed, but at their engagement party, he had sex in the bathroom at the party with Joe Lombardo's girlfriend Linda. This was witnessed by Alex Taylor, and later the secret came out (Linda confessed to Joe) which caused Joe to punch Jimmy in the face and Brooke to file for divorce. Joe and Jimmy later made up, although Jimmy's marriage was over. After Bobby was murdered, Kim sank into a state of depression, causing Jimmy to try and win sole custody of Joey. He won, but later allowed Kim access again after seeing how much she had improved. After the deaths of Alex and Lt Johnson, Jimmy was promoted to Lieutenant. He made a few mistakes at first, which caused tension between him and the others. At the same time, Kim and Jimmy started falling in love again, and had numerous one night stands during the course of