[noun] + きり [verb た-form] + きり
きり has two uses. After a noun or a number it means "only", "just": nothing beyond the amount named. After a verb's た-form it means the thing happened and nothing followed – "and since then, no more".
In casual speech it is often っきり: ふたりっきり二人っきり, あれっきり.
The noun is usually a number of people or times, or これ / それ / あれ. きり stresses that this is all there is or ever will be, and it sits in set phrases more than だけ does: ふたりきり二人きり is "alone together", いちど一度きり is "once and never again", これきり is "this is the last".
The verb is in the た-form. What comes after is usually negative: the person did not come back, nothing was heard again. The sentence can also stop at きりだ.