"It is with much consideration and a heavy heart that we are announcing that after 10 years of a loving relationship, the decision was made to move on without each other," the couple said in a statement released toPeople on Monday.
"We will carry with us the memories of a relationship grounded in love, laughter, support and friendship. We have experienced some of life's greatest joys and toughest challenges together and our decision to be apart can never diminish that. We want to thank everyone for their support and we ask that our privacy be respected as we move forward."
Their split probably comes as a surprise to most people, as the reality TV couple told In Touch Weekly in late November 2011 they were looking forward to marriage.
Zohn, 38, previously won Survivor: Africa and then went on to compete on The Amazing Race's nineteenth season as Morasca's teammate. Morasca, 32, was also the winner of Survivor: The Amazon.
Morasca remained by Zohn's side throughout his struggle with cancer. Zohn received chemotherapy treatments in late 2011 after learning in September of that year his cancer had returned following 20 months in remission. He subsequently underwent a second stem-cell transplant in February 2012.