Ex-Grateful Dead Drummer Mickey Hart — Wanted for Assault

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A warrant has been issued for the arrest of Mickey Hart — former drummer for the Grateful Dead — after the musician allegedly attacked someone at a recent concert … TMZ has learned.

Multiple law enforcement agencies tell TMZ … Hart — real name Michael Hartman — has been accused of assaulting a person at a Mickey Hart Band show on Sept. 8 at Terrapin Hill Farm in Harrodsburg, Kentucky.

Hart played with the Dead between 1967 and 1995 … the year Jerry Garcia passed away.

The details surrounding the alleged attack are unclear … but the alleged victim filed a police report following the incident and initiated assault charges.

We’re told it’s standard practice in Kentucky to issue a warrant as soon as an alleged victim decides he or she wants to press charges. 

Mickey’s camp tells us they’re looking in to the situation.