Agreed...and not only that he should have been executed by gunshot while his (presumed) ex-wife listened in.
I have given your suggestion some thought, because the same thought has passed through my mind.
Executing the guilty party using methods they used, would require a human to execute that sort of effort. I question if that price would be worthy.
It seems to me to be too much to ask. The impact on the person would certainly have to be considerable. Some murders are very gruesome. At some point it is unreasoned to pursue this method. I suggest, it probably is in all circumstances. Execute the person by the method approve by the representatives of the populace.
To rid society of this type of person, is enough.
I don't like to use Bible verses to buttress an opinion, but here it seems prudent to do so.
Dearly beloved, avenge not yourselves, but rather give place unto wrath: for it is written, vengence is mine; I will repay, saith the Lord. Romans 12:19
I do not believe God will punish in the manner the person has sinned. The person will be destroyed.