In her caption she wrote that Fredinburg 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."
The "Chicago P.D." star went on to encourage her 1.5 million followers to appreciate and hug their friends and family. "Please tell those you love that you do," she wrote. "Right now. This very minute. And please send a kiss to the sky for my friend Dan."
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
Fredinburg was climbing Mount Everest when the 7.8 magnitude earthquake triggered an avalanche, which killed at least 17 climbers. The Google executive's sister confirmed his death in an Instagram post on Saturday.
Fredinburg and Bush split in February 2014, but their breakup wasn't publicly announced until August.