FTX was once one of the biggest exchange platforms in the world allowing crypto investors to buy, trade and store digital currencies.
Mr Bankman-Fried is pleading not guilty to misusing customer funds and money laundering while bankruptcy lawyers are trying to locate the missing billions.
No one knows how the thief - or thieves - was able to get digital keys to FTX crypto wallets, but it is thought it was either an insider or a hacker who was able to steal the information.
Without using a mixing service to hide the illicit origins of their Bitcoin, criminals risk being caught or having their funds seized by cryptocurrency exchanges.
The rest of the stolen FTX stash - around $230m - remained untouched until 30 September - the weekend before Mr Bankman-Fried’s trial began.
Panorama explores the breakneck rise and sensational fall of Sam Bankman-Fried, the maths genius who set out to transform the world of crypto but ended up being its biggest loser.
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