Alex Foster 247 - Sport Style

PIX11 on MSN: Baylor football player Alex Foster dies after being shot multiple times: reports Baylor football player Alex Foster dies after being shot multiple times: reports 29 1) Alex's house 2) Alex' house When the noun ends with the letter 's' or 'x', do I need to put 's' after an apostrophe or not? I remember I read some rules related to this in my school grammar book, but now I've forgotten it.