A 20-year-old girl has been arrested for allegedly promoting the medication that killed Robert De Niro's grandson, in response to a police official.

Sofia Haley Marks was detained by New York City police and drug brokers on Thursday, in response to a regulation enforcement official talking anonymously.

She was anticipated to look in federal court docket on Friday.

Leandro De Niro Rodriguez, 19, died earlier this month, along with his mom claiming he died after being sold fentanyl-laced pills.

"So for all these people still f****** around selling and buying this s***, my son is gone forever," mentioned Drena De Niro on Instagram.

However, the town health worker has mentioned the reason for dying continues to be being investigated.

Hollywood legend Robert De Niro mentioned he was "deeply distressed by the passing of my beloved grandson Leo".

"We're greatly appreciative of the condolences from everyone. We ask that we please be given privacy to grieve our loss of Leo," he added.

New York Police mentioned Leandro was pronounced useless after being discovered "unconscious" and "unresponsive" on 2 July.

He adopted in his grandfather's footsteps in pursuing appearing and had small roles in Bradley Cooper's A Star Is Born, in addition to The Collection and Cabaret Maxime.