Why Did Dr. Sydney Heron Exit 'Grey's Anatomy' and Why Is She Back?
Heron’s last major involvement saw her unsuccessfully run against Dr. Callie for Chief of Surgery. Then I just sort of forgot about it." It just really came back very quickly. Image via Craig Sjodin/Disney General Entertainment Content via Getty Especially in the relationship with Bailey, they really set that up nicely. That was beautifully poised and has a nice arc to it. Grey’s AnatomySeason 21 airs on Thursdays at 10/9c on ABC with past seasons available to stream on Hulu....