He opened on his personal Facebook, sharing his feelings after everything.
“Christina was more than my sister,” he wrote (via People). “She was a partner in life. A superstar. A goofball. Introverted. And a friend to everyone. Genuinely.”
Mark added, “But above all…she was my baby sister. She loved the Lord and her family and was always there for me and I honestly don’t know what ill do without her.”