Kojiro Yamazaki (born June 13, 1965) is a Japanese musician who plays drums for The Ohayogozaimas since 2017, beginning with the Maeda EP. Beforehand, he had played a support drummer for The Ohayogozaimas before they had a dedicated drummer position. He also plays support for other bands, such as N.I.C.K..

Bandleader Dave Mustaine knew Behler because Gar Samuelson, the previous drummer for the band, used Behler as his drum tech. Behler eventually was fired by Mustaine for being a cocaine addict[2] and gave up his place in Megadeth to his own drum tech, Nick Menza.

Before Megadeth, Behler was a member of The Meanies and Sinclair, among other groups.

In an interview with Shawn Drover, Drover stated that Behler lives in the Detroit area and attends Megadeth shows whenever they are in the area.

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