Authorities had been searching the area since Rivera, 33, was reported missing after she rented a pontoon boat with her four-year-old son.
Morris added: “Yet, the utmost important lesson I learned most of all from you was being a consistent and loving friend.
Morris wrote on Instagram that the pair had “the most beautiful friendship built out of love and understanding”.
She said Rivera “constantly taught me lessons about grief, about beauty and poise, about being strong [and] resilient”.
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