July 22, 2012 15:57:04 GMT
The actor was joined by his wife Jennifer Flavin, Sage's mother Sasha Czack, his younger brother Frank and other mourners in Brentwood, Calif.
Sylvester Stallone attended his son Sage Stallone's funeral in Brentwood, California on Saturday, July 21. The actor wore sunglasses and black suits to the funeral, joining other mourners including his wife Jennifer Flavin, Sage's mother Sasha Czack, his younger brother Frank and his longtime attorney Marty Singer.
The private memorial service was held at St Martin of Tours Catholic Church. Sage's casket was then taken away by hearse to Westwood Village Memorial Park Cemetery in Los Angeles, where Sage will reportedly be buried and finally laid to rest. Fans held up placards showing photos of Sylvester and his son as a child outside the church.
Sage, who appeared with his father in 1990's "Rocky V" and 1996's "Daylight", died of a suspected drug overdose at the age of 36. The circumstances surrounding his death are still being investigated, and a post mortem was inconclusive.
"This agonizing loss will be felt for the rest of our lives. Sage is 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 said previously.