The autopsy of singer, rapper and former teen heartthrob Aaron Carter was performed on Monday

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But the cause of his death is yet to be determined

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Carter was found dead in the bathtub at his home in Lancaster on Saturday morning

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A house sitter discovered an unresponsive person in the bathtub and called 911

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He was the younger brother of Nick Carter of the Backstreet Boys

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Nick posted on Instagram "Even though my brother and I have had a complicated relationship, my love for him has never waned"

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Carter's twin sister Angel posted on Instagram, "To my twin... I loved you beyond measure. You will be missed dearly. My funny, dear Aaron, I have so many fond memories of you."

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"Before Justin Bieber, there was Aaron Carter... who had all the '90s girls in chokeholds. RIP," tweeted one fan

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Carter was born in Tampa, Florida

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