|Appearances||Zero Time Dilemma (mentioned)|
Sometime in the past, Diana's husband was a kind and serious man. After they married, due to an unknown reason, he became abusive and controlling. He gambled heavily, abused alcohol and physically abused Diana. He laughed while kicking and punching Diana, even for no reason in particular. After beating her, he always told her that he loved her.
Eventually, she became fed up with his behavior and divorced him, but he still continued to harass her at her work, requesting money or sex, and to reunite. One time he interrupted lunch she was having with a coworker. It was Diana's stress over being stalked by him that encouraged her to, at her friend Rebecca's request, participate in the mission at the Mars Mission Test Site.
It is unknown if he ever later received comeuppance for abusing Diana -- what happened to her after the true ending of ZTD is unknown.
- Diana's ex-husband plays a similar role to Eric's father; they are both unnamed abusive men who abused one of the characters in ZTD. In contrast, Diana's ex-husband seems to have made Diana into the somewhat timid and moody young woman she is, while Eric's father made Eric into an extremely quick-tempered and emotionally unstable young man.