Iago = I am ego,
‘I’ ‘a’m e‘go’!
A Satan in the guise of a man,
A green-eyed monster!
Iago has used Othello as a weapon,
To murder Desdemona,
And disturbed the Moor so much that,
He leads himself towards self-destruction!
It is rather rational to say then,
It is none but Iago who 'is' the ‘murderer’!