| Intro | Brazilian footballer |
| Is |
Athlete Football player Association football player |
| From | Brazil |
| Type | Sports |
| Gender | male |
| Birth | 28 April 1983, Santa Catarina, Brazil |
| Age: | 37 years |
William de Mattia (born 28 April 1983), also known as Dema, is a Brazilian footballer currently playing for Veikkausliiga club MYPA.