with him, giving her a scare that she might have been infected with a disease. Kim would suffer a terrible day at the end of season 4 when, on the same day, Taylor was killed, along with Noble and Lt Johnson, the boss of the 55 firehouse. This eventually drew her back into the arms of Jimmy, and the two began dating again. Jimmy proposed to Kim, but she turned him down, not knowing if he had really changed. But after she was attacked by men pretending to be police officers, she went back to Jimmy and accepted his offer, claiming he was the only true love of her life. Jimmy though soon got a promotion and left, leaving Kim by herself. She soon found out she was pregnant, and hid it from the rest of the firehouse. But when it came to a risky situation at Bosco's brother's funeral, she refused to go in and help, which lead to her revealing she was pregnant. She then decided to leave FDNY and remarry Jimmy. She was seen once again in the series finale with Jimmy, their son Joey and their new son, Kevin, at Carlos and Holly's wedding. Minor characters Firefighters Lieutenant Johnson Lt Johnson (frequently referred to as "Lou") was in charge of the firehouse from 2000 until 2003. He was married to Ruth and has a few children. Johnson has worked three jobs to keep money coming in for his family. He had been studying for the captain's test in 2001, but after 9/11 decided against this, as this would mean moving to a new firehouse, and he wished to stay with the 55. He died in 2003 as a result of the explosion which killed Alex Taylor, much to the grief of his family and those at the 55. His first name was never revealed in the series. Played by John Michael Bolger. Firefighter Derek "DK" Kitson Derek "DK" Kitson often did the cooking at the firehouse. He was usually the one coming out with the wisecracks. DK has a thing for coffee cake. He was promoted to Captain and took over the squad when Billy Walsh became battalion chief. Played by Derek Kelly. Firefighter Joe Lombardo Joe was Jimmy's best friend - this led to Jimmy even naming his son after him. Joe is the 3rd generation of his family to have the name "Joe Lombardo."