A Mexico, Missouri man charged with murder in Miller County will be back in court later this month. A case review has been scheduled for March 21st for John Powell. Powell was originally charged with six counts of assault and armed criminal action after allegedly beating and dragging a man behind his vehicle near the Bagnell Dam last September. He’s now charged with first-degree murder and armed criminal action. The victim in the case has been identified as 55-year old Mark Johnson, originally from Colorado.