Kentucky State Police have also charged 33-year-old Christopher Hill of Owensboro with the murder of 29-year-old Tromain Mackall.
Mackall lived in Ohio County and was reported missing to authorities on July 25th, 2016.
Officials say Mackall's body was found inside a toolbox floating in Spring Fork Creek in Grayson County.
Detectives were able to notify the KSP Crime Lab that they were able to successfully link Howard to the murder.
KSP found Howard in Brandenburg in March.
Howard and Hill are being charged with murder, kidnapping (death of a victim) and tampering with physical evidence.
They're both in the Daviess County Detention Center.