<P> Following the birth of his son Jack, Hotch's work with the BAU began disrupting his family life . Following a two - week suspension in 2007 (engineered by office rival Section Chief Erin Strauss after a case at a college campus in Flagstaff, Arizona that ended in disaster when both serial killer Nathan Tubbs and copycat killer Anna Begley died), he requested a transfer to a different division, which pleased Haley, until Derek Morgan (Shemar Moore) convinced him to help the team with a case in Milwaukee . He changed his mind about leaving the department, and when he returned home, he found that Haley had taken Jack and left him . He was later served with divorce papers at work . Hotch attempted to see Jack weekly, but was unable to spend time with him as often as he would like . </P> <P> At the beginning of the show's fourth season, it was shown that the car exploding at the end of season three was Hotch's SUV . Both he and SSA Kate Joyner were caught in the bombing outside the New York City Federal Plaza . Kate eventually died from her injuries, and Hotch suffered shrapnel wounds and a punctured eardrum which resulted in hyperacusis, causing temporary hearing problems . Later in the season, the team worked one of Hotch's old cases: the case of the Boston Reaper . Hotch revealed to Rossi that he had maintained an interest in the case over the ten years since he had investigated it . It was also shown that the Reaper, a power - hungry predator, had taken an interest in Hotch himself . </P> <P> After being misled for a time, Hotch and the team finally identified the Reaper as George Foyet, the only one to have supposedly survived the Reaper by injuring himself . Hotch and the team arrested Foyet but he escaped from prison shortly afterward, going on the run . In the season four finale, "...And Back", Hotch was confronted in his apartment by the Reaper (identified by his trademark mask). Foyet stabbed Hotch nine times and tortured him with a knife before delivering him to the hospital . Although Hotch survived, Foyet took Haley's and Jack's address from Hotch's apartment, requiring them to be placed in protective custody and unable to contact Hotch while Foyet was at large . Following the encounter with Foyet and subsequent loss of contact with Hotch's family, there was concern within the Bureau, and also on the part of Agent Morgan, that Agent Hotchner was suffering the effects of Post Traumatic Stress Disorder, and Hotchner's actions were analyzed more closely . In season 9, Hotch is hospitalized due to complications from the old stab wounds after collapsing in the team's conference room . </P> <P> When Chief Strauss began putting pressure on Hotchner to justify all of his tactical decisions, Hotch decided to step down as unit chief to avoid being reassigned to a different unit . He relinquished his position to Morgan, which he accepted on the condition that he would step down once Foyet had been captured . Shortly thereafter Foyet reappeared, baiting Hotchner through correspondence with an old unsub (The Fox) who had been convicted and imprisoned after being captured in the Season 1 episode, "The Fox". With the help of the team, Hotchner proceeded to track Foyet, who posed as a US Marshal in order to locate Haley and Jack . Having gained access to her Witsec - issued home, Foyet forced Haley to call Hotch on speaker phone . Hotch managed to issue a code to their son, Jack, which meant for him to go hide in his secret place . However, Hotch was unable to save Haley, whom Foyet murdered while she was still talking to him on the phone . </P>

Which episode of criminal minds does hotch get stabbed