A short time after, Jimmy's son "Little Jimmy" (George Christopher) came out of prison and resumed the heroin habit which had helped land him behind bars. Jimmy and Jackie forced him to come off the drugs by making him go cold turkey, however Little Jimmy still owed money to drug dealers who ended up murdering him in November 1996 (Ron Dixon having unknowingly shown them where he lived as he believed the dealers were police looking for the elder Jimmy). There was a brief respite for Jimmy and Jackie in July 1997 when, both in their forties, they had a third child, William. Jimmy attempted to make a fresh start and wanted to become a teacher, however, he did so by falsifying certificates, for which he had enlisted the help of neighbour Danny Simpson (Andrew Butler). Jimmy really enjoyed the job, however, after a few months Jackie became sick of the pretence of it all, mainly because Jimmy was really starting to believe his own hype. She spilled the beans at a dinner with two of his fellow teacher colleagues, who took a dim view. Jimmy was sacked soon after. Following this, he developed manic depression (bipolar disorder) and began experiencing hallucinations and delusions. He then got up one morning, convinced he was still a teacher, and arrived at the school to teach a lesson clad in mismatching shoes. This culminated in him locking his pupils in his classroom, where he shook tables and starting ranting and screaming. A boy in his class protested about this and called him a "weirdo". This led to the boy having a bloody nose as Corkhill grabbed him and smacked his face on a table. Consumed with guilt, he ran out of the class and went up to the roof, where he was ready to commit suicide. His daughter Lindsey Corkhill (Claire Sweeney) and neighbour Ray Hilton (Kenneth Cope) heard about this and tried to convince him not to kill himself. The police were also informed and rushed to the scene; two policemen went up to the roof, and were standing behind Corkhill, who jumped off the roof, but was saved just in time by one of the policemen. After this, he was advised to go to his GP and he was put on anti-depressants.