User blog comment:CoolJazzman/Was Aizen wife Tosen friend?/@comment-2226235-20131110183923/@comment-11051098-20131110232950

Tôsen was angry when he got to know that his friend's husband wasn't getting punished (I think) for killing her. Apparently he was told by the guards he tried to get past, but whether he knew the name of the man, or not, was never stated, as far as I know.

It wouldn't really surprise me if it was Aizen, but in that case, Tôsen would never have worked with Aizen if he knew it was him.