Marcus Hutchins pleads guilty to writing malware and aiding with its distribution with the help of a partner. Hutchins was arrested at Las Vegas airport on August 2, 2017, on his way home to the U.K., after attending the Black Hat and DEF CON security conferences as a security researcher. He is better known for his role in breaking WannaCry’s spread across the world and his online persona MalwareTech where he interacts with the information security community by helping those getting into the field, disseminating information about new threats.
Source: https://www.bleepingcomputer.com/news/security/security-researcher-pleads-guilty-to-malware-writing-charges/