Marcellus Vernon Wiley (born 30 November 1974 in Compton, California) is a retired professional American football defensive end who played 10 seasons in the National Football League for four different teams. He is known as Datdude and was selected with the 22nd pick of the second round of the 1997 NFL Draft out of Columbia University by the Buffalo Bills. After four seasons with the Bills, he played for the San Diego Chargers, Dallas Cowboys and Jacksonville Jaguars. He was selected to the AFC Pro Bowl team in 2001, as a member of the San Diego Chargers.