Amy Winehouse's father caught her in bed with Blake Fielder-Civil. Mitch Winehouse is said to be "sick with worry" that the 'Rehab' singer is seeing her ex-husband again.
When Amy's security guard told him Blake had arrived at the singer's home in Hadley Wood, North London, Mitch rushed there to confront the couple.
He reportedly threw Blake out onto the street where he loudly threatened to "punch his lights out," while Blake begged for mercy.
Friends say the incident has left the 58-year-old former taxi driver - who suffers from heart problems and high blood pressure - sick with rage and worry.
A source told Britain's The Sun newspaper: "Mitch hates the fact he's reappeared - it's making him ill. Mitch was absolutely furious, he still is. He can't believe Blake has wormed his way back into his daughter's life. He thinks it's the worst scenario for Amy. Just when she's starting to sort herself out, the man responsible for dragging her into the gutter is crawling back into her life."
"Mitch is praying history doesn't repeat itself. He is dreading the day he finds his daughter is back on hard drugs because of him. He's worried sick."
The steamy rendezvous is Amy and Blake's first meeting in 14 months.
The couple married in 2007 and divorced last month. Since they split last year, both Amy and Blake have been battling addictions to alcohol and drugs.
In a documentary called "Saving Amy," which aired in Britain last month, Mitch claimed Blake was the reason Amy started abusing illicit substances and warned the pair "would kill each other if they got back together."
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