The news outlet said that a septoplasty is a surgery to straighten out the septum to allow for better nasal airflow; if the surgical instruments cut too deeply, then the base of the brain could be damaged.
Lt. Elisabeth Albanese, a spokeswoman for the Beverly Hills Police Department, told Fox News via email there would be no new developments until after the autopsy, which was performed Monday.
Morton turned up dead in his home in Beverly Hills, Calif., PEOPLE reported.
Restaurants were the family business. His father, Peter Morton, co-founded Hard Rock Cafe and Hotels, and his grandfather, Arnie Morton, founded Morton’s The Steakhouse.
He previously owned the Viper Room nightclub in West Hollywood with Johnny Depp.
The tribute, posted on Instagram for Lohan's 8.1 million followers, included a black-and-white snapshot of the pair at the 63rd International Venice Film Festival in September 2006.
"Best friends. Best life," Lohan wrote.