Parse this person name:

Gretchen Killer (1463-1503, flourished 1480-1498)
user
first_name: Gretchen
last_name: Killer
middle_names: []
temporal:
- start: 1463
  end: 1503
  type: life_span
- start: 1480
  end: 1498
  type: flourished
titles: []
extra_info: []
assistant