Complete story — includes the ending
Beckett accepts Castle's marriage proposal, before moving to Washington DC for her new job, where she begins training and meets her new partner, Rachel McCord ( Lisa Edelstein ). After six weeks apart, Castle surprises her at her apartment, where he causes some trouble when he attempts to help her with a classified case. Castle returns home to discover that Alexis has brought a new boyfriend, Pi, back from her trip to stay with her. Castle is soon taken into Federal custody, where Beckett tells him he was exposed to a deadly chemical agent and has only one day to live.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Castle season 6. HTML formatting and reference markers removed. · Content license