Blake Fielder-Civil, who married singer Winehouse in Miami, Florida, in 2007, was found choking on his own vomit in bed by Sarah Aspin, the mother of his 15-month-old son Jack, and hospitalized in Yorkshire, England, according to multiple reports.
Doctors put him on a life support machine after he allegedly swallowed his tongue and suffered multi-organ failure.
Aspin tells Britain's The Sun newspaper, "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."
Fielder-Civil, whose pop star ex-wife Winehouse passed away almost exactly 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.
He met Aspin in rehab.
She tells The Sun Fielder-Civil had been doing well and the couple was making plans to wed, but she fears he relapsed after meeting a friend last week.
She adds, "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."