A source close to Kate Cassidy tells PEOPLE exclusively that Liam Payne's "erratic behavior started ramping up" when she left Argentina, where they were on vacation. The One Direction alum died on Oct.

The One Direction star, who was 31, fell from a hotel balcony in Buenos Aires, Argentina, on October 16. State police arrived at the CasaSur Palermo Hotel after receiving an emergency call, with the officer in charge saying he heard a loud sound in the inner courtyard when they reached the scene.

Argentine authorities reported the death of Liam Payne, after falling from the third floor of the CasaSur hotel in Palermo.

Liam Payne was found dead in Argentina. The One Direction singer died after falling from his hotel balcony in Buenos Aires, as reported by Reuters.

Although they split more than 10 years ago, Danielle Peazer said she and the former One Direction member "knew we'd have some sort of connection forever."

Liam Payne’s grief-stricken girlfriend Kate Cassidy emerged out in public for the first time in Florida on Sunday -- just days after revealing she was at a "complete loss" over the One Direction star's tragic death in Argentina.

Liam Payne, 31, a former member of One Direction, was found dead on Wednesday in Buenos Aires after falling from a hotel balcony, according to local authorities. Payne suffered "extremely serious injuries" after falling from the third story of the Casa Sur Hotel in the hip Palermo district of the capital of Argentina,