Dr. Edwin Bracewell was an android modelled after a Scottish human made by the Daleks after they landed in 1941. He was placed in a War Room alongside Winston Churchill. He was unaware of his origins, and was implanted with memories of a human life and the creation of the Daleks as a weapon called an 'Ironside' for Britain.
When Churchill summoned the Doctor and Amy Pond to his base, the Doctor caused the Daleks to reveal their true nature. The Daleks revealed Bracewell as their own creation, blasting his hand off.
After the Doctor foiled the Daleks' original plan, they revealed that Bracewell's android body contained an Oblivion Continuum as a power source, and threatened to use it as a bomb and destroy the planet. The Daleks activated the bomb and fled.
The Doctor and Amy tried to stop the Oblivion Continuum from detonating by using Bracewell's memories - which had been stolen from an actual human and contained every detail and emotion of his human life - to force Bracewell to embrace his humanity. Memories of the postal office his 'parents' worked in and nearby ash trees, the trenches of the First World War, and the death of his parents were not enough. It was only when Amy reminded him fancying someone he knew he shouldn't - Dorabella - that his android programming was broken, thus deactivating the weapon.
Afterward, Bracewell assumed the Doctor would deactivate him as he was Dalek technology, and had "no business" on Earth. At first he accepted this fate, but was overjoyed when he eventually caught on to their hints they would do otherwise. Instead, they encouraged him to seek out a normal human life, looking for the postal office and Dorabella. (DW: Victory of the Daleks)
It is possible that there was an actual human Edwin Bracewell, as the Doctor mentioned that the android probably had the memories of a real human implanted in him. If this is the case, then it is likely that the Daleks killed the real Bracewell after they extracted his memories or transfered his brainwaves to the android.