The Los Angeles Police Department's elite Robbery-Homicide Division has joined the probe into the death of Sage Stallone, son of the famed "Rocky" star Sylvester Stallone.
But police stressed that there is no evidence to suggest there was a criminal element involved.
Police said that until the coroner confirms the cause of death, Robbery-Homicide investigators would be involved.
The unit is also involved because the case is considered high-profile and celebrity-related, police said.
The Stallone family, meanwhile, released a statement on Monday, imploring people to respect "my wonderfully talented son's memory."
"When a parent loses a child there is no greater pain," the statement read. "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."
An autopsy was completed Sunday, but the results would wait for toxicology tests.
Sage Stallone was found dead at his Hollywood Hills home Friday.
"We don't know what the circumstances are around it," Sage Stallone's attorney George Braunstein told NBC Los Angeles. "He was in good health, great spirits. He was thinking of getting married, working on a lot of film projects."
Coroners officials said there were no signs of foul play or trauma and that there was no suicide note.
Assistant Chief Coroner Ed Winter told the Associated Press that prescription bottles were recovered in an investigation, but he could not say what kind or how many, and whether they had a role in his death.
Braunstein said Stallone's housekeeper found him Friday afternoon and that he did not believe reports that he had overdosed were true.
"It's a tragedy," Braunstein said.
Sage Stallone, 36, was the oldest of Sylvester Stalone's children and had appeared in a number of films, including "Rocky V," "Daylight" and "Chaos." He also directed the 2006 short "Vic."
A funeral was being planned for Saturday.