The Fort Worth Press - Father of One Direction star Payne arrives in Argentina

Geoff Payne landed in Buenos Aires at 6:00 am, the source said.

The source did not say whether he would visit the morgue where the body of his son, the 31-year-old member of one of Britain's most successful pop groups of recent years, is being kept pending the results of toxicological tests.

Payne suffered "multiple traumas" and "internal and external hemorrhaging" after falling from the balcony of his room on the third floor of the Casa Sur hotel in central Buenos Aires on Wednesday night, an autopsy found.

The autopsy suggested he had not tried to stop his fall and was in a state of "semi or total unconsciousness" before his death.

The singer, who had spoken publicly about struggles with alcohol and coping with fame from an early age, was alone at the time and appeared to be "going through an episode of substance abuse," prosecutors said.

He was found dead after hotel staff called emergency services twice to report "a guest who is overwhelmed by drugs and alcohol, and destroying his room," according to leaked audio.

Tributes to the singer have been pouring in since Wednesday.

His former One Direction bandmates, Niall Horan, Harry Styles, Louis Tomlinson and Zayn Malik, said they were "completely devastated" by his death.

Rolling Stones guitarist Ronnie Wood, the Backstreet Boys and NSYNC also offered their condolences, as did British Prime Minister Keir Starmer.

Payne was in Argentina to attend a concert by Niall Horan.

Argentine media published photos which they said showed the interior of his hotel room, with white powder on a table next to a piece of aluminum foil and a lighter, and a television with a broken screen.

Fans have left a mound of letters, flowers and pictures of the singer at a makeshift shrine to him outside the hotel in Palermo district.

"I feel like it's a part of adolescence lost," said Lena Duek, 21.

Payne is the father of a seven-year-old boy, Bear, shared with Girls Aloud star Cheryl Tweedy.

W.Matthews--TFWP