So if I may sum up:

Margarito was convicted and suspended for attempting to cheat against Mosley, which to most knowledgeable and reasonable boxing fans casts serious doubt over many of his previous fights (once a cheater, always a cheater). After being found out... he proceeded to lose 3 out of his next 4 fights, including getting KTFO'ed by Mosley, a huge beating at the hands of Pacquiao, and a sweeeeeet payback beating from Cotto.

Shortly thereafter he decides to retire from boxing in disgrace.

Did I miss anything?