Actress Sophia Bush has publicly remembered her former boyfriend Dan Fredinburg, a Google executive killed on Mount Everest by the after-effects of a devastating earthquake in Nepal over the weekend.

Bush paid tribute to “one of my favorite human beings on Earth” and “one of the great loves of my life” in a post to her Instagram account on Saturday night.

• Terrifying footage shows horror of Nepal quake
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Sharing a photo of Fredinburg, 33, taken in the popular Rain Room exhibit at New York’s Museum of Modern Art, Bush mourned her friend, and encouraged fans to appreciate their loved ones.

“Today I find myself attempting to pick up the pieces of my heart that have broken into such tiny shards, I’ll likely never find them all,” the 32-year-old said.

“Today I, and so many of my loved ones, lost an incredible friend. Dan Fredinburg was one-of-a-kind. Fearless. Funny. A dancing robot who liked to ride dinosaurs and chase the sun and envision a better future for the world.

“Please remember that each person who is now gone was someone’s Dan. Please remember that our time on this Earth is not guaranteed. Please tell those you love that you do. Right now. This very minute.”

Fredinburg, who dated Bush from January 2013 to February 2014, was killed when a 7.8 magnitude earthquake triggered an avalanche on Mount Everest, killing him and an estimated 16 other climbers.

Fredinburg’s sister Megan confirmed his death from a “major head injury” in a post to his official Instagram account.

“I regret to inform all who loved him that during the avalanche on Everest early this morning our Dan suffered from a major head injury and didn’t make it,” she wrote.

“We appreciate all of the love that has been sent our way thus far and know his soul and his spirit will live on in so many of us.”

In memory of Fredinburg, Bush is helping to raise money in his name for children affected by the disaster, tweeting a link to a crowdfunding site where people can donate to the cause.

There are no adequate words. Today I find myself attempting to pick up the pieces of my heart that have broken into such tiny shards, I’ll likely never find them all. Today I, and so many of my loved ones, lost an incredible friend. Dan Fredinburg was one-of-a-kind. Fearless. Funny. A dancing robot who liked to ride dinosaurs and chase the sun and envision a better future for the world. His brain knew how to build it. His heart was constantly evolving to push himself to make it so. He was one of my favorite human beings on Earth. He was one of the great loves of my life. He was one of my truest friends. He was an incredible brother, a brilliant engineer, and a damn good man. I’m devastated and simultaneously so deeply grateful to have known and loved him, and to have counted him as one of my tribe. I was so looking forward to our planned download of “all the things” when he got home. I am crushed that I will never hear that story. I am crushed knowing that there are over 1,000 people in Nepal suffering this exact feeling, knowing that they too will never hear another tale about an adventure lived from someone that they love. Disasters like this are often unquantifiable, the enormity is too much to understand. Please remember that each person who is now gone was someone’s Dan. Please remember that our time on this Earth is not guaranteed. Please tell those you love that you do. Right now. This very minute. And please send a kiss to the sky for my friend Dan. His energy is so big and so bright, and it’s all around us, so put some love toward him today. And then hug your loved ones again. #goodbyesweetfriend #savetheice #Nepal #AdventureswithDAN

A photo posted by Sophia Bush (@sophiabush) on Apr 25, 2015 at 2:07pm PDT