Priya Koothrappali was Raj's sister. Played by actress Aarti Mann, she appeared on 12 episodes (via IMDb). Her arc showed her dating Leonard, but their relationship didn't work out because ultimately, she was afraid to tell her family she was dating someone outside of her culture. Their relationship ends with Priya heading back to India.

Reddit user ImMabin123 noted that we don't hear much about Priya after she and Leonard split, though there was a possible update on her life in season 10: "In S10 E16 Raj's dad says to Raj that out of his 6 children 5 of them are married which means Priya is married I don't know if people noticed this."

Another fan pointed out a piece of evidence that might support the theory. A scene from another episode shows a wedding photo on Raj's fridge. "There may be a photo of Priya's wedding on Raj's fridge," the fan noted. We wish we could have gotten to see what a Koothrappali family wedding was like, but we'll just have to use our imaginations for now.