Arthur was Rebecca Downey's controlling husband. Rebecca had run away from him and hid in the mountains when she met Shane Donovan, who didn't know who he was. Rebecca offered to help him, but when Arthur showed up he and Rebecca got into a fight, and Rebecca Shane believed she had killed Arthur. Shane and Rebecca went on the run, however Arthur was not dead, and continued to follow Shane and Rebecca.
Rebecca Downey had been on the run from her controlling husband and was camping out in the mountains outside of Salem. When Shane Donovan stumbled upon her tent he had no idea who he was. Unfortunately Rebecca's husband Arthur showed up and Rebecca got into a fight, both Rebecca and Shane thought Arthur was killed. Shane and Rebecca went on the run and told people they were man at wife. At a small Cabin they were staying at Rebecca found Shane's wallet which contained his real ISA badge, but she hid it from him. Rebecca wanted to use Shane to help her escape her husband plus she had fallen in love with him.
Shane eventually found out the truth about who he was, but he still couldn't remember anything. Shane and Rebecca returned to Salem, and when Shane went home he found Kimberly making love to Cal Winters in his bedroom. Shane quickly left and he and Rebecca went to Chicago to try and clear Rebecca's name, not knowing that Arthur was still alive.
Rebecca's name was eventually cleared, and she and Shane returned to Salem. Cal had devised a plan in which he set Kimberly up to murder Shane, thinking he was a burglar. Rebecca refused to let this happen, so Cal shot and killed her.