Armie Hammer is mourning the death of a loved one. On Monday, the actor, 34, announced the tragic news that his grandmother died. "There just aren’t words to describe the loss. I love

you so much, Grandma," he wrote on Instagram alongside an old portrait of his grandmother. _NEVER MISS A STORY — SIGN UP FOR PEOPLE'S FREE DAILY NEWSLETTER TO STAY UP-TO-DATE ON

THE BEST OF WHAT PEOPLE HAS TO OFFER, FROM JUICY CELEBRITY NEWS TO COMPELLING HUMAN INTEREST STORIES._ The tragic loss for Hammer comes less than three months after the _Call Me By Your Name

_actor split from wife Elizabeth Chambers. In July, Hammer announced he and Chambers, 38, were separating after 13 years together. The couple share two children: daughter Harper Grace, 5,

our priority." In an interview with _British GQ_ last month, Hammer called the separation from Chambers a "seriously seismic event." "I don't think you'll find

anyone in the world who would ever say what I’m going through is an easy thing to go through," he told the outlet. "It’s not about whether it was your idea or not, or whether you

think it’s the right idea or you don’t." "There's a lot of shifting and a lot of growing pains and a lot of changes," he said of the split. In early September, the actor

was spotted having lunch with writer Jessica Ciencin Henriquez (who was previously married to actor Josh Lucas) months after they both split from their respective partners. The two were seen

sitting close while chatting during the meal, with Hammer photographed leaning in to talk to Ciencin Henriquez. Following the outing, Hammer was later seen out walking arm-in-arm with Rumer

Willis. A source told PEOPLE Hammer is enjoying being single for the first time in his adult life. “He and his ex were together since he was 20 years old so he’s just going out and meeting

people but not dating anyone," the source said.