Sad, but not that unexpected, news today was confirmed by Megadeth on their social media channels:
On May 10, 2021, sexually explicit videos of Ellefson were posted online. The videos, reportedly recorded in 2018 by a fan that Ellefson was in correspondence with, initially led to accusations of child grooming. However, Ellefson and the other party both denied the accusations and claimed that it was consensual adult conduct. An official statement released the next day from Megadeth stated that the situation was being “watched closely”.
On May 24, 2021, Dave Mustaine released the above statement stating that, in light of the recent allegations and an already strained relationship, Megadeth had officially parted ways with Ellefson again.