Cameron came to town in the spring of 2012. He met Celeste at the hospital. Celeste introduced Cameron and revealed that he was Lexie's half-brother. Celeste explained that Cameron had been taken away from her when he was five years old, and she had not mentioned him before because the situation was too painful to talk about.
With a smile, Cameron said that he had met Lexie before. Cameron showed the framed photograph to Lexie. The photo was of Lexie, Cameron, and Celeste. Fighting tears, Lexie noted that the picture had been taken back when she believed Celeste was her aunt. Celeste explained that Cameron was also a doctor, like Lexie.
Cameron also had a flirtatious run-in with Abigail on his fist day in Salem. Their flirtation continued the next several times they met. Eventually, the two began dating. She helped him through the loss of his sister, Lexie. And, he got the seal of approval from both Jack and Jennifer.
The night of an autism benefit in Lexie's honor, there was a huge explosion in the tunnels underneath Salem. Abigail and Jack were trapped in the elevator. Cameron and Jennifer worked to free them. Abigail got out, but the elevator broke before Jack could escape as well. Jack died in the accident.
Heartbroken by her father's death, Abigail threw herself into her relationship with Cameron. But, when Cameron felt that Labial was trying to deal with her grief by wanting to have sex with him, he broke things off with Abigail.
He went on a few dates with a woman named Emily, but that relationship did not last. Soon, he got back involved with Abigail. Abigail was embarrassed when Cameron found out that she had been a member of the "Golden Circle" club in high school -- a group of kids who promised to wait to have sex until they were married. But Cameron assured Abigail that they could take their relationship at her pace.
But, Cameron was still keeping a secret from Abigail.