Cause of death determined for Robert De Niro's grandson

The cause of death for Leandro De Niro Rodriguez, the grandson of Oscar-winning actor Robert De Niro, has been determined.

According to an email sent to CNN from the New York City Medical Examiner's Office, the 19-year-old's death in July was the result of a toxic combination of fentanyl, four other drugs and cocaine.

His death has been ruled an accident.

Fentanyl is extremely deadly on its own, but among drug deaths, it is common for people to die with multiple drugs in their systems, including cocaine.

A woman was arrested in connection with the teen's death.