Steven to become a murderer??

[Perdita]

I am personally glad he is going. I am not keen on him as a character really... and if you ask me, trying to smother someone with a pillow is attempted murder.. it will be a good way for the character to go and I always found it unrealistic the way he came out of the clinic suddenly being presented as being in a reasonable state of mind and trying to be 'pally' with Jane after he shot her! so I'm glad his psychotic nature is resurfacing as it wouldn't have dissapeared just like that!.. makes it realistic I think..

What made Steven turn this way though? Has it been mentioned? I have only been watching on and off...I think we need proper justification from the EE writers over why he has turned out this way..

I think I read somewhere that we find out more about his past and that what happened in New Zealand is merely the tip of the iceberg.

He will be gone in a month, so not that much time to explore his history if they want to show the life of other residents at Albert Square as well. As Sean is also quite busy right now ruining other people's lives, I fear we shall never know wtf is wrong with Steven.