Still confused about what happened to Dr. Heather Collins (Tracy Ifeachor) on The Pitt? British actress Tracy Ifeachor had second-billing after Noah Wyle on the first season of the HBO Max hit, but is nowhere to be seen in The Pitt Season 2. So what happened to Dr. Collins on The Pitt? Well, The Pitt Season 2 Episode 4 “10 AM” finally reveals why she’s no longer on the show. **Spoilers for The Pitt Season 2 Episode 4 “10 AM,” now streaming on HBO Max**Partway through The Pitt Season 2 Episode 4, “frequent flier” patient Louie Cloverfield (Ernest Harden Jr.) asks Dr. Dennis Whitaker (Gerran Howell) where Dr. Collins has been all this time.