Bones, or Dr. Temperance Brennan, became pregnant after sleeping with Booth following a particularly traumatic event.
The Context of Brennan's Pregnancy
The pregnancy was a direct result of:
- A Tragic Event: The death of Vincent Nigel-Murray.
- Emotional Vulnerability: Brennan and Booth sharing intimacy in the wake of this loss.
- The Culprit: This happened after Vincent Nigel-Murray was killed by Booth’s old mentor-turned-enemy Jacob Broadsky.
This pivotal moment significantly altered their relationship and storylines within the series.
