Sylvester Stallone's former wife wants control of their dead son's estate.

Sage Stallone died from a heart attack in July and his mother Sasha Czack has asked a judge to give her control over his personal property, which she values at $40,000, as he did not leave a will, according to TMZ.

The 36-year-old actor was found unresponsive on July 13 at his Studio City apartment and the Los Angeles County Coroner has determined there was evidence of heart disease when he died.

Following Sage's tragic passing, Sylvester, spoke out about his loss.

He said: ''When a parent loses a child there is no greater pain. Therefore I am imploring people to respect my talented son's memory and feel compassion for his loving mother Sasha.''

He also begged for the memory and soul of Sage - who played the actor's onscreen son in 1990 movie 'Rocky V' - to be ''left in peace'' amid speculation of how he died.

He added: ''This loss will be felt for the rest of our lives. Sage was our first child and the centre of our universe and I am humbly begging for all to have my son's memory and soul left in peace.''