Sylvester Stallone has hired a private investigator to find out exactly what happened to his son, the 36 year-old actor and auteur,  Sage Moonblood Stallone.

Sage Stallone’s body was found last Friday by a housekeeper at his messy Studio City home. There were no signs of foul play nor a suicide note, but prescription bottles were recovered at the scene. Toxicology results are still pending which will determine the cause of death. According to TMZ, Stallone has met with P.I. Scott Ross to discuss details of the investigation with the actor, his brother Frank and an L.A. County Coroner rep.

Following Sage’s passing, Stallone quickly addressed early news reports that his son died of a drug overdose. “This is in reference to the speculation and questionable reporting surrounding the death of my son Sage. Because when a parent loses a child there is no greater pain. 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.”

Sage Stallone’s funeral will take place on Saturday at St. Martin of Tours Catholic Church in Los Angeles. In lieu of flowers, Sage’s mother, Sasha Czack requests that donations be made to the advocacy of Autism Speaks. Sage’s younger brother and Stallone’s son, Seargeoh has autism.