Mara had also shared a series of pictures of her spending time by the St Lawrence River, with an image from 2019 accompanied by her caption: ‘63 degrees! Life affirming river swim, first one of the season.’
The actress, also famed for roles in ‘ER’, ‘Shameless’, ‘Dexter’ and ‘Law and Order’, is understood to have been visiting her sister when she got into difficulty during a morning swim.