Mariah Carey's brother Morgan fears she will 'die like Whitney Houston' as he claims that his sister is caught in a suicidal web of alcohol and drug abuse.

Morgan said he fears that the 45-year-old diva 'is struggling on a number of levels,' getting worse by the day, and the people around her are not doing anything about it.

He may not have directly spoken with Mariah in two years but he said that he is concerned that, 'She does not have a support system, and she is not mentally capable.'

Morgan believes that his famous sister may be unfit to care for her four-year-old twins Moroccan and Monroe, for she’s been trying to numb her mental struggles with wine and champagne.

"Mariah was drinking through her pregnancy - even while she was nursing," he added.

Morgan said that in addition to the alcohol, Mariah is on a daily cocktail of powerful medications such as Zyprexa, Ativan and Depakote.

“If my sister turns up dead … I’m not going to look the other way!” he said. “Anyone who’s filling her glass is jeopardizing her life!”

The frustrated sibling also said that Nick Cannon “was never good for Mariah” and only in it for the money.

Sources claimed that the 'Always Be My Baby' singer drank champagne until dawn and obsessed over why ex-husband Nick left her.

“She stays up all night, looking at every frame of herself in every photo and dissecting it to death,” a source told Us Weekly, claiming Carey will sometimes stay up until 7 in the morning drinking prosecco.

The source also revealed that Mariah is self-conscious and is not happy with what she looks like at the moment.

“She is beautiful but has major body issues. She wants to look like a teenager in every photo and won’t approve anything until it’s airbrushed to an insane level.”

According to Morgan, Mariah Carey's drinking troubles snowballed after she began experiencing mental health issues back in 2001. The issue was dubbed as her "emotional and physical breakdown."