Jack Patrick Deveraux was born on Melaswen after his mother, Jennifer, went in search of his father, Jack, who was believed murdered by the Salem Stalker nearly nine months before his birth. He nearly lost his life on numerous occasions, but luckily made it back to Salem alive and well. He is named after his father, Jack, and Patrick Lockhart, the man who helped bring him into the world. When Jack and Jennifer reunited, they accepted jobs as reporters for a London newspaper.
When Jack and Jennifer returned to Salem in 2011, J.J. stayed in London and attended boarding school. When Jack died in 2012, Jennifer and Abigail went to London to visit J.J. He announced that he wanted to start going by "Jack" to honor his father.
In April 2013, J.J. returned to Salem a few weeks early before the end of his semester. Jennifer and Abigail were thrilled to see him, but Jennifer soon learned the real reason that J.J. was home early. He'd been kicked out of school for selling marijuana. J.J. denied it, blaming it all on his roommate. Jennifer said she'd get to the bottom of it, but in the mean time, ordered him to enroll in summer school at Salem U.
J.J. also did not approve of his mother's new relationship with Daniel and began acting out. Jennifer thought that J.J.'s odd behavior was stemming from the fact that J.J. was still grieving for his father, but she didn't know the extend of J.J.'s actions. He started getting high, slashing Daniel's tires and windows, and breaking Daniel's and Parker's things.
J.J. also continued to slip further into drug use and distribution. He stole prescription drug samples from the hospital to sell and tried to steal Cameron's prescription pad. He also became friends with Theresa Donovan, who became one of his clients as well. The two shared a flirtation, much to Jennifer's dismay.
Trying to score money for drugs, J.J. and his friends robbed an electronics store. While walking through the town square, one of J.J.Ős friends made a hurtful comment about Alice and Tom Horton and J.J. got into a fight with the friend. When the police came to break up the fight, they found the stolen merchandise. J.J. was taken into the station, but Justin was able to get J.J. released back into his motherŐs care.
But, J.J. was still angry. Jennifer was so frustrated with him that she finally tried some tough love and told J.J. to move out of her house. She was done supporting him.
J.J. made it his mission to break up Daniel and Jennifer and would tell everyone how terrible Daniel was. When ranting to Kayla about how Daniel would never be the man Jack was, Kayla let it slip that Jack was no saint. J.J. pressed her for more information, but she told him to go talk to his mother. J.J. got a little more information from Adrienne, but found out the truth by going home and reading the transcript from Lawrence Alamain's trial -- Jack had raped Kayla years ago.
J.J. was furious, both with the news and the idea that everyone had kept this information from him. He ran to the town square and threw a chair through the bookstore window, destroying a display of Jack's book. He got into a physical altercation with a man trying to stop him and was arrested for assault and vandalism.
The judge ordered J.J. to move back in with Jennifer and would suspend his sentence, giving J.J. a chance to show the court that he had changed. J.J. agreed in court, but immediately left as soon as he went home, telling Jennifer that she was a liar and he didnŐt want to be around her. He ended up at TheresaŐs house one night and the two of them smoked marijuana together. Theresa suggested taking a liquid ecstasy, known as G, before they slept together. J.J. didn't want to take the drug, so Theresa took both her and J.J.'s drinks and overdosed. She passed out.
Worried that she seriously hurt herself, J.J. picked up Theresa's phone and called Daniel to come help. Knowing that being caught with an overdosed female in his company would send J.J. right to prison, Daniel ordered J.J. to leave through the backstairs and not to tell anyone that he was there. Then, Daniel tended to Theresa, arriving at the hospital with her. When he arrived, everyone assumed that he had given Theresa the drugs because the two of them were sleeping together.
A stunned and scared J.J. went back home and told Jennifer and Abigail that he was done with drugs and was home for good. Jennifer was thrilled. J.J. also apologized to Daniel for putting Daniel in the position to have to let other people think that Daniel was sleeping with Theresa. Daniel told J.J. to keep you the guise that the two of them don't get along so that no one will suspect that J.J. was with Theresa doing drugs the night she overdosed.
Theresa seemingly took steps to make herself better, including talking to Maggie about attending NA and apologizing to Daniel. But the truth was that Theresa remembered everything that happened that night and was just pretending to have amnesia in order to drive a wedge between Jennifer and Daniel, thus making Jennifer's life worse.
When J.J. finally confessed to Theresa that he was the one who was with her the night that she overdosed, she laughed at him and told him that she was faking all along. J.J. was furious with her and wanted to tell everyone that it wasn't Daniel with her when she overdosed. But, Theresa showed J.J. a video she made that night of J.J. smoking weed. She threatened to send the video to the judge if J.J. didn't do exactly what she said. (J.J. was on probation, awaiting a formal sentencing from assault and disturbing the peace charges.)