A Missouri man is behind bars after authorities say he allegedly beat his mother to death with a gardening tool after demanding his inheritance. Derrick Alling, 39, is facing first-degree murder and armed criminal action charges, according to court documents obtained by Fox News Digital. ALLEGED DEVIL'S DEN KILLER INVESTIGATED IN MULTIPLE UNSOLVED MURDERS ACROSS US THAT HAVE ONE THING IN COMMONFox News Digital was unable to immediately locate an attorney representing Derrick Alling. "The victim had been recording the defendant acting aggressively and violently towards her within weeks of her murder," authorities said. Derrick Alling has pleaded not guilty and is scheduled to return to court on Oct. 14.