She was the most troublesome prisoner as well the most enigmatic. She was the reason they had such high security for her part of the prison. They were all under instructions that if she even started packing they had to tell the governor. The thing was she just sat there most days reading or writing in that little blue book. They'd tried everything to get her to talk about her crime but she kept her silence through the cold treatment, through knife torture even through electrodes. She kept her silence, that's what they didn't understand she had nothing else to lose, so why didn't she talk. She was an enigma. Behind her aqua eyes and flirtatious smile was a murderer. It was hard to believe she flirted her way her way through the days and years. Her smile never faltered except from when she thought no one was watching her face would fall if they didn't know her any better they'd say it was regret but they knew her too well. That woman could kill without thought, without conscience. This woman had been born to kill; it was second nature to her.

River Song was the woman who killed the Doctor.