Diane McClintock
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- "He said, 'Innocents? If they haven't chosen to defend Rapture, they've chosen to side with Atlas and his bandits. So there are no innocents. There are heroes, and there are criminals"
- ―Diane McClintock[src]
Diane McClintock was Andrew Ryan's fiancee/lover before the conflict in Rapture got out of control. As Ryan became more megalomaniacal, she grew more and more disturbed by his excesses in combating Frank Fontaine and as a result joined up with Atlas against Ryan, even going so far as to go on combat and scavenging missions.
Recordings found by the player while exploring in Apollo Square suggest that Diane McClintock was murdered after accidentally discovering that Atlas was not who he said he was. What is likely her corpse is found on Fontaine's desk in Atlas's headquarters.
As mentioned in the first few diaries, she went to the Medical Pavilion to have some kind of a facial reconstruction after the 1959 New Year's Eve Riots wounded her face, and it is insinuated (through both her and Dr. J.S. Steinman's audio diaries) that she may have been the first victim of Steinman's obsessive insanity. Needless to say, her face was not in its original condition when she left the Medical Pavilion as it was prior to the New Year's Eve ball.
While in the Medical Pavilion, McClintock heard rumors of what was happening between Atlas and Ryan (and the subsequent social decline of Rapture) from people going in and out of the area. She did not truly believe them, but after returning to Apollo Square, she realized how much the citizens of Rapture were suffering from the effects of fear-induced splicing and the battle between Atlas and Ryan. In fact, she was extremely furious towards the supporters of Atlas for "ruining" her body in the way that it was until she became aware of Ryan's corruption. After coming back to Apollo Square and seeing the mass hangings and murders of people not committed enough to Ryan, she became disillusioned and was then taken in by the supporters of Atlas.
The audio diary "The Longest Con" heavily implies that she was killed by Fontaine upon accidentally catching him doing something that revealed his true identity.
It is possible, though unlikely, that Diane's last name, "McClintock", is a reference to renowned cytogenetecist Barbara McClintock, who contributed considerable understanding to the concept of genetic recombination during cell division, among other topics (her work eventually netted her a Nobel Prize).

