8:25 AM PT -- Aaron's brother, Nick Carter, just weighed in on Instagram with a lengthy tribute ... "My heart has been broken today. Even though my brother and I have had a complicated relationship, my love for him has never ever faded. 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.
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He continued, "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. I will miss my brother more than anyone will ever know. I love you Chizz., now you get a chance to finally have some peace you could never find here on earth….God, Please take care of my baby brother."
Aaron Carter's death touched off a chaotic situation inside his L.A. home ... as his housekeeper was heard screaming over the police scanner after discovering his body.
TMZ has obtained a police audio clip of the moment the housekeeper found Aaron unresponsive inside his bathtub Saturday morning and frantically called 911.
The 911 operator stated on the audio clip FIRE/EMS units were needed at Aaron's home for a "female yelling" and made a cryptic reference to "in the tub."
By the time paramedics arrived on scene, Aaron was already dead. Authorities have not released an official cause of death, but law enforcement sources tell TMZ police will be doing a deep dive into his past drug use.
Aaron's fiancé, Melanie Martin, later told TMZ ... "My fiancé Aaron Carter has passed away. I love Aaron with all my heart and it’s going to be a journey to raise a son without a father. Please respect the privacy of my family as we come to terms with the loss of someone we love greatly. We are still in the process of accepting this unfortunate reality. Your thoughts and prayers are greatly appreciated."