Antonio has two children with his ex-wife Laura Dawson. He often spends time with his children Eva Dawson and Diego Dawson now he is no longer in the Chicago Police Department. His wife wanted a divorce because his job as a detective was having an impact on family life.
Dawson had a short romantic relationship with paramedic Sylvie Brett. Unfortunately, Antonio's situation with his ex-wife proved too stressful on their relationship and they ended it. The couple did leave the future open when things settle down.
Dawson's son, Diego, was kidnapped by a criminal that Intelligence was pursuing in Stepping Stone. In Wrong Side of the Bars, Pulpo handed Intelligence an ultimatum, otherwise Diego would die. However, Antonio and the team were able to rescue him, and he was willing to do anything it took to get his son back.
This combined with Antonio getting shot in My Way leads to his wife, Laura, becoming worried for his wellbeing, and she asks him to quit working in Intelligence. He refuses and tells her it's his job. Voight also tells him that she can't just expect him to stop working. However, in A Beautiful Friendship, he and Laura get into a fight. When Antonio returns home at the end of the day, he finds his house empty and a letter from her. She leaves him and takes the children, who are then rarely seen, but they do come over ocassionally, indicating some sort of custody arrangement.
In Chicken, Dynamite, Chainsaw, Eva turned up at the station to see her dad. He was furious that she'd travelled to see him on her own, without telling her mother, and told her something could've happened. However, he feels guilty when she tells him it's because she misses him and he's not in her life anymore. He tells her that him, her and Diego will always be a family, and also to never run away like that again.
In The Cases That Need to Be Solved, Diego was with Antonio for his birthday, and he asks for a video game, which Antonio doesn't want to get him, telling Diego that he needs to understand that he can't always have what he wants when he gets upset. When he then works on a tough case involving a young child who had been killed. After Diego's party, Antonio takes him to the boy's vigil.
Sylvie asked Antonio out later on, which Antonio refused to do. He told her he liked her but he couldn't bring her in the mess with him and Laura, his ex-wife, but Sylvie insists they'll work it out. They started going out happily, and Sylvie even learnt to play chess to impress his son, Diego. However, Antonio gets stuck at work and asks her to take care of Diego for a few hours, and Laura comes to the firehouse and lashes out at her, saying that she can't believe Antonio is leaving her children with 'blondes'. Antonio comes to see her after and tells her he shouldn't have put her in that position, and she says he should've warned her. He says he told her he was a mess, and she says he didn't say that his ex-wife would be the one taking her anger out on her, and that clearly he and Laura aren't ready to move on. Antonio says he doesn't need to hear from her on top of Laura and his job, and she says he won't, and they break up. Sylvie didn't take it well, and they left hope for the future, and she remained concerned about him.
Antonio got a job offer from Peter Stone in 300,000 Likes to join him as Chief Investigator. He found out that Voight had suggested him and given his name forward, and he interpreted it as him not being a good detective which was why Voight was 'transferring' him out. Voight told him that he gave his name because he was a great detective and he deserved a promotion. Antonio accepted it and left Intelligence in A Shot Heard Around the World.
Chicago Police Department
Antonio joined the CPD at a young age and after passing the academy, had Trudy Platt as his Field Training Officer. He then pulled Platt out of the line of fire when she was shot during shootout.
Dawson soon showed his abilities to ranking officers and was quickly assigned to the VICE unit and worked with them for a few years before transferring.
Hank Voight recruited Dawson into the Intelligence Section after he was arrested by him and saw that he was a determined and honest police officer. Dawson and Voight had somewhat of a strained partnership through the first few seasons, but soon they figured out how to work together.
Antonio resigned from the CPD after receiving a job offer from Peter Stone.
State Attorney's Office
Dawson was offered a job by Peter Stone to join the State Attorney's Office as a Chief Investigator. His partner investigator is Laura Nagel.
- (To Eva Dawson): "You, me and Diego, are a knot that will never come undone."
- (To Gradishar): "You don't know what we do, or what we sacrafice, or the price we pay for this." (referring to being a CPD officer.)
- Antonio was friends with Jay and was the one who brought him to Intelligence.
- Antonio is an avid boxer, just as actor who portrays him, Jon Seda.
- Though no exact age is given, it has been mentioned Antonio and his sister Gabby are about 10 years apart in age.
- Antonio's character is known as the crossover king in the Chicago series, being that he started as a recurring character on Fire then a main character on PD and a main character on Justice. Not to mention an episode on Law and Order SVU.