The four members of ABBA announced her death themselves on social media.
"It is with the deepest sadness that we announce the passing of Görel Hanser. We have lost our most beloved friend and closest colleague. It is a huge loss," the ABBA members wrote in a post on Instagram.
Görel Hanser began working in the 1960s as an assistant to Stig Anderson, ABBA's manager at the start of the group's success. The ABBA members split with Anderson in the 1980s, and Hanser later became the group's manager and close collaborator - an important figure in the wider business empire the members built around various projects.
Görel Hanser was married to photographer Anders Hanser, who took many of the classic photos of ABBA in the 1970s.
