What makes a final farewell truly memorable? For Don Rickles, the legendary insult comic, it wasn't a barb, but a whisper of love that echoed through the decades. His last public words, a tender anniversary message to his wife, Barbara, revealed a depth of emotion that lay beneath the surface of his famously acerbic wit.

Don Rickles, a name synonymous with sharp humor and quick wit, passed away from kidney failure at his Los Angeles home on Thursday, April 6, 2017, at the age of 90. The news, confirmed by his publicist to CNBC's Los Angeles bureau, sent ripples of sadness through the entertainment world. While many anticipated a final zinger, Rickles' last public message, shared on Twitter three weeks prior, was a touching tribute to his wife of 52 years. "We are celebrating our 52nd wedding anniversary March 14th. Happy anniversary my dear wife, Barbara. You are my life." These poignant words offered a glimpse into the man behind the microphone, a man who, despite his comedic persona, cherished the deep connection he shared with his beloved Barbara.

Rickles' career, spanning over six decades, began just after World War II. He honed his craft in small clubs, initially struggling to find his niche. His brand of "insult comedy," though now iconic, was considered too abrasive for mainstream audiences in the early years. It wasn't until the late 1950s, when Frank Sinatra, captivated by Rickles' fearless ribbing, took him under his wing, that his career began to soar. Sinatra's endorsement opened doors, leading to appearances on television and in films alongside other entertainment giants like Johnny Carson and Dean Martin. Despite later feeling betrayed by both men, Rickles career continued to flourish. He became a regular guest on late-night talk shows, his rapid-fire insults delivered with impeccable timing and a mischievous glint in his eye. He even ventured into acting, appearing in films like "Kelly's Heroes" and lending his voice to beloved animated characters like Mr. Potato Head in the "Toy Story" franchise.

Even at 90, the idea of retirement was foreign to Rickles. In February 2017, just two months before his passing, he was still actively working, promoting a retrospective DVD set and planning future concert appearances. This dedication to his craft, this enduring passion for making people laugh, is a testament to his unwavering work ethic. Scot Cru, the executive producer of Rickles' final project, "Dinner with Don," spoke of the comedian's relentless drive and commitment to his art. He described Rickles as a force of nature, always eager to connect with his audience and leave them with a smile.

The exact nature of Rickles' final private words may remain unknown, but their significance lies not in their literal meaning, but in the broader context of his life and career. They offer a glimpse into the heart of a man who, despite his public persona as the "Merchant of Venom," possessed a deep capacity for love and connection. His final tweet, a testament to his enduring love for Barbara, stands in stark contrast to the biting humor that defined his career, revealing a vulnerability and tenderness that resonated deeply with his fans. While he may be remembered for his sharp tongue and comedic insults, his final message serves as a reminder that even the most acerbic wit can harbor a heart of gold.

Don Rickles was indeed a unique figure in American comedy. He represented a bygone era, a time when insult comics could be both loved and respected. He carved a niche for himself by turning the art of the insult into a form of endearment, a way of connecting with people through laughter, even at their expense. His ability to deliver cutting remarks without causing genuine offense was a testament to his comedic genius and his innate understanding of human nature. He made fun of everyone, from presidents to everyday people, and in doing so, he became a beloved figure, a cultural icon whose legacy continues to inspire and entertain.

His passing marked the end of an era in comedy, leaving a void that may never be filled. But while his voice is now silent, his legacy of laughter lives on, a testament to the power of humor to connect us, even in the face of lifes inevitable curtain call. He was, after all, the insult comic everybody loved.