Between a horrific serial killer and a shocking heart attack, Dr. Reese's Chicago Med exit was a gripping watch.

After six years, Dr. Sarah Reese, played by Rachel DiPillo, is back on Chicago Med. Find out why she left and whether or not she’s likely to stick around. In the preview for Chicago Med Season 10, Episode 8,

The Chicago Med cast has said goodbye to many members, including Rachel Dipillo, who used to play Dr. Sarah Reese. Dipillo was one of the original Chicago Med actresses, first serving as a medical student at Gaffney in Season 1.

Rachel DiPillo was a mainstay during the first three seasons of Chicago Med before leaving unexpectedly. Here's what you need to remember about her exit.

To say that Chicago Med’s Dr. Charles and Dr. Sarah Reese didn’t part on good terms is putting it mildly, but that’s how the former doc describes their falling out in Wednesday’s fall finale when his former protégé resurfaces.