Mustaine made the revelation while filming a new video message on Cameo.
Last month, sexually tinged messages and explicit video footage involving Ellefson were posted on Twitter.
The band's leader Dave Mustaine announced Ellefson's exit in a statement earlier today (Monday, May 24).
The move comes over a week after the leak of the MEGADETH bassist's messages and videos featuring a woman who is not his wife.
Sexually tinged messages and explicit videos involving the bassist were leaked on Twitter
The series was created with a Phoenix radio show host.
Scott's Bass Lessons videos shows off top bass techniques.
MEGADETH bassist said, "We're literally in the final hours of getting everything done".