They hacked 5 of his wallets.
McAfee said that the hackers are targeting Bitcoin by infiltrating everyone's tablets, phones and PCs with malware. This malware is designed to monitor all your activities on line, and to look for keywords specific to having a Bitcoin acccount/wallet which activate a routine to take screen shots with every keystroke. They empty your wallet by signing on, after you are gone, and empty your wallets.
McAfee said there is no software solution to stop this, but may be a hardware solution, but right now there is no solution.
I suspect McAfee will start up a hardware company to sell the solution.
People have their accounts hacked everyday, but this particular operation is specofic to bitcoin, according to McAfee.
If you keep your PC clean of malware, then you have no worries.