<P> The oldest son of the current New York City Police Commissioner Frank Reagan and his wife Mary, Danny grew up in Bay Ridge, Brooklyn with a younger sister, Erin, and two younger brothers, Joe and Jamie . He was happily married to Linda since 1996, with whom he has two sons, Jack (b . 2001) and Sean (b . 2004), until Linda's death between seasons 7 and 8 . They lived on Staten Island until their home was destroyed in a fire in the season 7 finale, which was set by a drug cartel in retaliation to a recent bust Danny made . During high school, Danny dated Marianne Romano (Charisma Carpenter), who was described by his partner Baez as "the queen bee, super good looking, a little crazy, and dynamite in the sack" to which he agreed . As a young man, Danny worked construction . </P> <P> For a class project of Nicky's, Danny mentioned that when he was three years old, he wanted to be a firefighter for Halloween, but his grandfather Henry swore that as long as he was alive, no Reagan would ever be a member of the FDNY, got him into a police uniform, and he "never took it off" until he made Detective . </P> <P> On the job for 15 years (as of season 1), Danny took a leave of absence from the New York City Police Department to serve two tours in the Iraq War as a Marine . Danny saw combat in Fallujah, and was the only member of his platoon to come home alive (resulting in some post-traumatic stress). During his time in the Marines, Danny was decorated for heroism . </P> <P> He is old - school; his hotheadedness and harsh methods of detective work sometimes get him in trouble, which his father worries about . When asked if his son "crosses the line" and violates procedure from time to time, Frank answered, "I think he walks on the line". Danny is hard on other policemen and detectives when he feels they are unprofessional or not doing their duty to its utmost . He is currently assigned to the Detective Squad of the 54th Precinct, and partnered with Detective Maria Baez . In "Most Wanted", it is mentioned that he leads the Manhattan South Detective Borough in both collars and complaints . In "Love Stories", he and Baez are awarded the NYPD Medal for Valor for their actions in "Partners". </P>

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