Sage Stallone (†36) was born in 1976 in Los Angeles to Sasha Czack (67) and Sylvester Stallone (71). He made his acting debut in Rocky V, acting alongside his father. Father and son starred in a second film together, Daylight, in 1996. Sage also worked as a director and producer.  

Se fue a la corta edad de 36: el trágico fallecimiento de Sage, hijo de Sylvester Stallone

The body of the young director was found in his house in Hollywood in July 2012. Rumours abounded that the cause of death was drug abuse, but a recent statement declared heart failure to be the official cause of death.

Sylvester Stallone's son Sage Stallone in 2005.

Tragically, this isn't the first hardship that the Stallone family has had to face. Stallone's first daughter Sophia Rose (21) was born with a hole in her heart in 1996. She had to undergo surgery, which, luckily, was a success.