Who shut down LimeWire?

Can you shed some light on the mystery surrounding the shutdown of LimeWire? Who was the driving force behind this decision, and what might have motivated them? Was it a legal issue, perhaps a violation of copyright laws? Or was it a business decision, perhaps due to declining user numbers or a shift in the market? Whatever the reason, the impact on users and the file-sharing community as a whole has been significant. So, who made the call to shut down LimeWire, and why?