Three suspects have been charged in the ongoing investigation into the death of One Direction singer Liam Payne for their alleged involvement in the pop star’s sudden death last month.

Argentina’s National Criminal and Correctional Prosecutor’s Office announced in a statement shared in Spanish on Thursday that it had found evidence of “illegal conduct” by three people – including an employee of the hotel where Payne fell. The charges include abandonment of a person followed by death, and supplying and facilitating narcotics. The suspects, who were not identified, were charged last Friday in a 180-page indictment against Judge Laura Graciela Bruniard, the statement said.

Payne, an “X Factor” alumnus who also pursued a solo musical career after his One Direction days, died on Oct. 16 after falling from a third-floor balcony of a Buenos Aires hotel. He was 31.

In a preliminary autopsy shared a day after the singer’s death, Argentine officials said authorities found substances that appeared to be drugs in the singer’s room, in addition to evidence of alcohol and narcotics.

Officials conducted nine raids and heard “several dozen” testimonies from people including hotel staff, Payne’s family and friends, medical professionals and other experts, according to Thursday’s announcement. Police analysts also reviewed more than 800 hours of surveillance footage from in and around the hotel, searched the contents of Payne’s phone (including calls and messages from various messaging and social media apps), and reviewed guest registration and the singer’s orders . from the hotel bar and restaurant to gain insight into his drinking and eating habits.

Cybercrime Unit officers also obtained information from hotel reception mobile phones and volunteer witnesses to corroborate statements.

Prosecutors allege that one of the defendants accompanied Payne daily during his stay in Buenos Aires. Payne died two weeks after arriving in Argentina, where he attended a concert by former One Direction bandmate Niall Horan on October 2. This defendant was charged with abandonment of a person followed by death, and delivery and facilitation of narcotics, the statement said. The remaining two suspects were charged with supplying narcotics.

One defendant is a hotel employee who allegedly supplied Payne with cocaine during his stay. The other is a suspected narcotics supplier who has already been accused of dealing drugs in separate incidents, Thursday’s statement said.

The investigation into Payne’s death is ongoing and the prosecutor said she was considering ruling out the possibility of suicide because “in the state (Payne) did not know what he was doing and could not understand it.”

In October, officials determined Payne died of multiple trauma and internal and external bleeding caused by the fall. He “did not adopt a reflexive position to protect himself and … he may have fallen into a state of semi- or total unconsciousness,” officials said last month.

Payne had traces of alcohol, cocaine and a prescription antidepressant in his system shortly before his death, Thursday’s statement said. Prosecutors confirmed Payne’s body had been delivered to his father, Geoff Payne.

Payne’s remains will reportedly be flown back to his native London, one of the cities where One Direction fans gathered last month to celebrate the singer’s life and music.

Payne’s song ‘Do No Wrong’ was set to be released posthumously last week, but plans were quickly put on hold after fans backed out.

“Today I decide to ‘Do No Wrong’ and leave these freedoms to all family members,” Payne’s associate Sam Pounds said in a since-deleted tweet last week. “I want all proceeds to go to a charity of their choice (or however they choose).”

Pounds added: “We are all still grieving Liam’s passing and I want the family to be able to (mourn) in peace and prayers. We will all wait.”

Times writer Nardine Saad contributed to this report.