it looks like a new typo and should have been שָמתי, unless you quote the whole sentence so we can be sure about the context.

it's not a typo - it's read: shemati or she mati. the whole sentence is: it will look a little like I died, or in literal translation: It will look a little like that I died. ani mati in the past: I died.... shemati is that I died

It seems to me that there is a letter that gone missing. I'll take a guess that it should have been written this way - שמנתי which means I've put some weight on.