Authorities do not believe Sage Stallone was a drug addict, a source familiar with the case told ABC News, in part, because his weight did not indicate drug addiction.
At the time of his death last Friday, Stallone was 5 feet 7 inches tall, and weighed 188 pounds, and wasn't the rail-thin figure often associated with addiction.
The family of the 36-year-old actor and son of action-star Sylvester Stallone met with the Los Angeles County Coroner's Office Tuesday and expressed worry that Sage Stallone may have been overmedicated before his death. The meeting focused on the status of the investigation.
The Los Angeles Police Department's robbery-homicide division had been brought into the investigation, but officials said it remained primarily a coroner's investigation and that there were no signs of foul play.
Sage Stallone's mother had hinted at the pain her son was in in the weeks before he died after undergoing extensive dental surgery.
Sasha Czack, Sylvester Stallone's first wife, told the New York Post that her 36-year-old son had been on pain pills when he died after having had five teeth pulled. The extractions took place two weeks before he was found dead in his Los Angeles-area apartment Friday.
Czack said she advised him not to get the surgery, telling the Post, "I've heard about people dying having multiple procedures done to your mouth. Do not have more than one tooth [pulled]."
When the Post asked whether he was taking painkillers afterward, she said, "Wouldn't you be?"
It could take weeks to learn Sage Stallone's official cause of death. A spokesman for the Los Angeles County Coroner said Sunday that the results of the 36-year-old actor's toxicology tests would not be known for approximately six weeks. An autopsy was completed Sunday.
Sylvester Stallone released a new statement Monday, calling for an end to "the speculation and questionable reporting" about his son's death.
"When a parent loses a child there is no greater pain," he said in a statement to TMZ. "Therefore, I am imploring people to respect my talented son's memory and feel compassion for his loving mother, Sasha. 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."
On Sunday, Sage Stallone's attorney said his client "never had any serious health problems" and no "history of drug or alcohol abuse."
"Sage was a really young, very sensitive, and very talented kid," attorney George Braunstein told People magazine. "There has been no indication that there was anything wrong in his life."
Sage Stallone's body was found by a housekeeper, who called authorities. While there was no suicide note found at the scene, authorities said there were bottles of prescription drugs.
Sage Stallone played Rocky Balboa's son in "Rocky 5" in 1990 and appeared in the movie "Daylight" with his father. He also directed the 2006 short film "Vic."