David Wells had a history of occassionally getting into fights.
Not just with himself but with others too
And yes, MLB teams will often lie about what really happened. In the minors sometimes too.
I knew a guy who had to go into the hospital for 2 weeks because he caught an antibiotic resistant strain of gonorrhea.
Official announcement from the team was a slight hammy strain
http://www.thesmokinggun.com/documents/sports/beaten-slurring-david-wells-calls-911
http://www.thesmokinggun.com/sites/default/files/imagecache/175xUnlimited/photos/wellspic.jpg