“My heart is broken,” he wrote. “Even though my brother and I have had a complicated relationship, my love for him has never ever faded.
“I have always held on to the hope that he would somehow, someday want to walk a healthy path and eventually find the help that he so desperately needed.”
Despite the fact that the exact cause of death is unknown, Nick has blamed "addiction and mental disease" in his tweets.
“Sometimes we want to blame someone or something for a loss, but the truth is that addiction and mental illness are the real villains here. I will miss my brother more than anyone will ever know. I love you baby brother,” he said.