Blake Fielder-Civil is reportedly fighting for his life following a suspected drink and drugs binge.
Amy Winehouse's ex-husband, who married the singer in Miami in 2007, was found choking on his own vomit in bed by Sarah Aspin, the mother of his 15-month-old son Jack, and hospitalised in Yorkshire, according to multiple reports.
Doctors put him on a life support machine after he allegedly swallowed his tongue and suffered multi-organ failure.
Aspin - who he met in rehab - told The Sun: "The doctors don't know the prognosis and put him in a coma to help him. I'm praying he'll survive but I'm having to prepare myself that he may never wake up."
Blake, whose pop star ex-wife Amy passed away almost a year ago, has battled a heroin addiction, and confessed to introducing his ex-wife to crack cocaine and heroin in an explosive 2008 interview.
She told The Sun Blake had been doing well and the couple were making plans to wed, but she feared he relapsed after meeting a friend last week.
She added: "He's never really been a drinker, but when he got home with this friend, he was slurring his words and staggering. I thought he was on something. I was very angry because he'd been doing so well."