A woman from Middlesbrough won £597,697.86 while playing Chests of Plenty at online casino Sky Vegas.
The winner, who has only been identified as "DW" took home the largest non networked jackpot in Sky Vegas' history on Easter Sunday.
Speaking of her big win, DW said: "When the amount I had won popped up on screen I started shaking uncontrollably and felt utterly sick. It was late at night but I had to tell someone immediately so I called my partner and woke him up. Neither of us slept a wink that night!"
Sky Vegas Spokesman Robert Parker also spoke out about DW's massive win, saying: "Huge congratulations go to our winner on landing the progressive jackpot! It is the largest Sky Vegas specific jackpot we have ever paid out and I'm sure it made a nice Easter surprise,"