pastor eric isaiah adusah has been charged with the murder of his pregnant wife , charmaine spears .
ms speirs and mr adusah , who were married last september , were said to have argued during their stay .
local news reports said an autopsy showed the mother of one died of ` opiate heroin overdose ' .
mr adusah 's defence lawyer mr adomako acheampong has claimed in court that 41-year-old .