Nick Carter responds to his brother Aaron's passing at age 34: "God, please watch over my little brother."

Nick Carter, Aaron's older brother, said on Instagram that he is devastated by Aaron's passing at the age of 34.

Despite their "complicated relationship," his love for Carter "has never faded."

Nick Carter, a Backstreet Boys member, wrote in a caption alongside photos of the brothers through the years.

"I have always held onto the hope, that he would somehow, someday want to walk a healthy path and eventually find the help that he so desperately needed,"

"Sometimes we want to blame someone or something for a loss. But the truth is that addiction and mental illness is the real villain here."