Andrew Welton was the ex-fiancee of Camille Saroyan, and a murdervictim. Cam left Andrew when she learned that he was having liaisons with other women, Cam concluding that she couldn't stay with him under these conditions.
Andrew Welton was a doctor until he was murdered by a nurse at his hospital, who resented the fact that she had always been there for him throughout all his relationships and he had never noticed her.
His daughter is Michelle Welton who Cam later adopts. Michelle's mother had been dead long before him, with Cam being the only relationship Andrew ever had that was also close to Michelle.