"So sad for you Sare and your precious family. Sending love and prayers to you all and see you soon. God bless you 💙🙏🌈💫🌼," Lynne McGranger wrote.
"All my love to you ❤️❤️," Courtney Miller wrote with Lana Wilkinson adding, "❤️❤️ Thinking of you."
"Sarah, we love you and wish we could help take some of this pain away for you. Huge love and thoughts to your family ❤️," her close friend Georgie Parker said.
Karl's passing was also announced in a death notice yesterday. The heartbreaking statement read: "De Abrew, Karl (late of Clontarf and formerly of Melbourne, Australia) – October 23rd, 2019, peacefully at Beaumont Hospital. Beloved husband of Susana, loving father of Alexander and Aurora, and son of Sharma and Neil.
"Very sadly missed by his wife, children and parents, his brother Rowan, sisters Sarah and Lauren, extended family in Australia, neighbours and friends. Reposing at the Kirwan Funeral Home, Fairview Strand, on Thursday evening from 5pm to 7pm. Removal to Dardistown Crematorium on Friday afternoon for a celebration of Karl's life at 2pm."
Three months ago, Sarah told WHO she and James Stewart decided to marry in Ireland so her beloved brother— who was too sick to travel overseas— could attend the wedding. The couple tied the knot at Luttrellstown Castle.
"I wanted it to be a celebration of love and the important thing for us is for our families to come together and for us all to be together and everyone to just have an enjoyable time," she told us. "My brother lives [there]. He's not able to fly at the moment because of health reasons."
Less than a month before the wedding, Karl told his Twitter followers that he was undergoing chemotherapy and radiation to treat his "15-year old brain tumour".
Karl was a successful businessman and worked in the PDF software space. He's also famous for being the founder of Nitro— a company that now has 135 employees and is headquartered in San Francisco.
While he was modest about his achievements, he described himself on Twitter as "a seasoned speaker, moderator, industry commentator, software developer, entrepreneur and a driving force in the early days of the PDF industry."
Rest in peace.