The Pitt stars are reacting to news that Tracy Ifeachor won't be returning as Dr. Heather Collins for the show's second season. "It's very sad when anyone leaves a cast or leaves a show," Isa Briones, who plays Dr. Trinity Santos, told Us Weekly exclusively at the Variety Power of Young Hollywood Party in Beverly Hills on Thursday, August 7. "I'm really excited to see what else she does. She's a beautiful human being." Supriya Ganesh, who plays Dr. Samira Mohan on the HBO series, also weighed in. "I was so sad to hear she's not coming back," she told Us.