Mark Rutter faces life in jail after a knife attack on a William Hill staff member because he lost on a roulette machine.
Rutter 39 and from Liverpool stabbed the worker at William Hill in the neck with scissors after demanding his losses be returned to him.
CCTV shows Rutter breaking into an area just for staff at the William Hill betting shop and losing his temper after playing one of the many gaming machines in the betting shop.
The William Hill staff member named as Ryan Drummond at the betting shop in Dalkeith, Midlothian was stabbed twice in the neck with Rutter screaming demands for his 200 pounds back.
Rutter got away with 180 pounds in notes and 20 pounds in coins and was later found sitting by the riverbank counting the money he stole.
Rutter admitted assault and robbery in a Scottish court and said he was visiting his girlfriend in Scotland at the time.
Presiding over the case was Judge Lord Uist who called for background reports and then remanded Rutter into custody until February.