Walken's eyes appeared sunken in, and his back seemed hunched as he dressed in a monochromatic black ensemble while leaving the swanky Manhattan eatery.
Walken showing up for his The Deer Hunter costar must have been welcoming as the Amsterdam actor recently suffered the tragic loss of his grandson, Leandro De Niro Rodriguez, to a drug overdose after the young man was allegedly sold "fentanyl-laced pills" at age 19.
"I'm deeply distressed by the passing of my beloved grandson Leo," De Niro said in a heartbreaking July 3 statement. "We're greatly appreciative of the condolences from everyone. We ask that we please be given privacy to grieve our loss of Leo."
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De Niro's daughter Drena De Niro confirmed her child's passing, paying tribute to him on social media. "My beautiful sweet angel. I have loved you beyond words or description from the moment I felt you in my belly," she penned alongside a smiling photo of him.
"You have been my joy, my heart and all that was ever pure and real in my life. I wish I was with you right now. I wish I was with you. I don't know how to live without you, but I'll try to go on and spread the love and light that you so made me feel in getting to be your mama," she continued. "You were so deeply loved and appreciated and I wish that love alone could have saved you 😞. I'm so sorry my baby."
Daily Mail obtained the photos of Walken leaving the party.