Undecided Question

This day I committed a grizzly sin.
Her judging eyes had killed my caring soul.
My hand I pushed against her no clothes skin,
She fell onto the cold cement below.

Her lifeless corpse was staring through my core.
Her grey, abusing eyes were perished now.
My heart was racing, morals put in store,
I moved as fast as body could allow.

The rails I pulled from present, stable stands,
And wiped away the trace from fingertip.
I placed the railing by the lifeless hands.
The scene resembled now a luckless trip.

I’m sure they won’t suspect a thing at all,
My wife’s untimely accidental fall.

–

I'm writing this sonnet for English class and it needs to be in iambic pentameter for me to get full marks. Can someone explain to me the words that aren't in rhythm? It would be SO greatly appreciated!

Also, here are some more specific questions:

- I'm 70% sure "committed" (1st line) isn't following the rhythm. I'm willing to replace it with "carried out" which I'm sure would fit – but committed just sounds so much better.

- In the forth line, I'm still unsure which syllable is stressed in "cement".

- Line 11 is a catastrophe, I know. Any help with that one would be appreciated.

- In the 12th line, I'm unsure about the rhythm for "resembled".I am willing to replace "resembled now" with "duplicated" but, again, "resembled now" sounds much better.