Sage Stallone: Everything to Know About Sylvester’s Late Son’s Film Career and Life

The ‘Rocky’ actor’s son died at the age of 36 in 2012 after suffering from coronary heart disease caused by atherosclerosis. 

Sylvester Stallone suffered a devastating loss in 2012 when his son, Sage Stallone, died at the age of 36. The Rocky actor’s late child was found dead in his Studio City, Los Angeles, home at the time, and reports surfaced that he hadn’t spoken to anyone in the days leading up to his untimely death.

The Rocky actor briefly opened up about his son’s death in his Netflix documentary Sly, which was released on the streamer on November 3, 2023. Keep reading to learn more about Sage’s life, career and death. 

What Happened to Sage Stallone? 

The late actor and filmmaker was discovered deceased in his home. Though officials found bottles of prescription pills in Sage’s house, his autopsy determined that there were no drugs in his system other than an over-the-counter pain reliever. Sage died from atherosclerosis, which led to coronary heart disease. 

Due to apparent rumors circulating around Sage’s tragic death, his father addressed the speculation in a statement at the time, per CNN. 

“Because when a parent loses a child, there is no greater pain,” the Rambo star pointed out. “Therefore, I am imploring people to respect my wonderfully talented son’s memory and feel compassion for his loving mother, Sasha, because this agonizing loss will be felt for the rest of our lives. Sage was our first child and the center of our universe, and I am humbly begging for all to have my son’s memory and soul left in peace.”

Sylvester shared Sage with his ex-wife Sasha Czack. 

Who Was Sage Stallone’s Fiancee? 

The identity of Sage’s fiancée has not been revealed. However, multiple outlets reported that he was engaged and wanted to get married before he died. 

What Does Sylvester Stallone’s ‘Sly’ Documentary Say About Sage? 

Sly examines Sylvester’s extensive film career and relationships. The synopsis reads, “For nearly 50 years, Sylvester Stallone has entertained millions with iconic characters and blockbuster franchises, from Rocky to Rambo. This documentary tells his underdog story and its parallels with the characters he brought to life.” 

The Expendables actor’s doc briefly touches on Sage’s death, revealing how the trauma of that loss had an impact on Sylvester’s career. Sylvester’s documentary, Sly, is streaming on Netflix now. 

In the film, Sylvester reflected on how Rocky V is similar to what his real-life relationship was with Sage. “I try to take something that actually is what I wish I had done in real life, but I wasn’t able to do that in reality,” Sylvester explained. “And so, quite often, I would do it theatrically, magically. … Unfortunately, you put things before your family. And the repercussions are quite radical and devastating.”

What Movies Did Sage Stallone Star in? 

Sage made his on-screen debut alongside his dad in Rocky V, portraying the titular character’s son, Robert Balboa Jr. He then went to star in several films, such as Daylight, Chaos, The Agent and Promises Written in Water. After appearing in Rocky V, Sly spoke a little bit about taking inspiration from his relationship with his son for the movie on the red carpet premiere of the film. “There’s a line in the movie, ‘I’m so glad he’s born because now I can live through your eyes,'” he said, per Men’s Health. “That, I think, is what fathers look to their children for. It’s an extension of, a slice of immortality. As long as he’s alive, your memory will always be alive, that you did something right. I mean, you hope for that.”

The California native was an avid film pro. After appearing in the Rocky franchise, Sage graduated from Montclair College Preparatory School and studied filmmaking at the University of North Carolina School of the Arts.