A 75-year-old American businesswoman has been killed by a hippopotamus while on an African safari with her family.

Carol Sue Kirken, of the suburban Detroit town of Rochester Hills, Michigan, died on Saturday while on a family vacation in Tanzania.

The circumstances surrounding her death are unclear, but her obituary states she ‘died quickly in the arms of her son Robert.’

Her final post on Facebook said that they’d seen a mass migration of hippos and bull elephants on the same day she died,¬†Fox 2 Detroit¬†reported.