This message was originally posted by Davidsmuse1 but it was considered a spoiler in a regular thread, so I copied it and posted it here.
More from his interview:
David "was very much in love with Carmen," but he wasn't able to be with her because he was married. He and his wife were having problems. "David fell in love with Carmen, but it was too much for Carmen because his wife had something to do with her being fired. So, David had to let her go. He's regretted it every day since." Carmen moved to Genoa City after being fired, and she was promptly murdered. "David was working in Europe," Vincent said. "He decided to come back to the US and ask her to marry him, but he came back and learned she was dead."
Carmen sent David a videotape of the fight she had with Drucilla just before her death, so he arrives armed with "proof" of who killed her. "He feels the case should be pointed toward Dru. David is very determined and, at the moment, seems very honorable."