No, he was not
excommunicated -- whatever gave you that idea? Cutie :-P converted of his own accord to the Episcopal Church (you know the one with the gay and lesbian "married" clergy).
Cutie ;-P could have remained in the Catholic Church by foregoing being a priest. I have a grand-uncle in my family who was a priest, but asked to be allowed to resign his post to marry a woman -- that was granted. The Catholic Church realises we are all human and if a priest wants to leave the priesthood to marry, so be it. Cutie had that option, but he didn't exercise it.
The Catholic Church also allows married men to become priests (but not priests to get married) in the Eastern Catholic Churches.
laicization and formal excommunication are two different things. the former is reserved to the Pope and is a long process with many steps. It may be done on the request of the priest for instance by a priest who wishes to leave and get married. According to published reports of which there are dozens of existing threads here, this priest did NOT choose to go that route but simply left without even, according to his bishop, asking or telling his superior of his decision.