The most deadly dinosaur that roamed the earth is the Tyrannosaurus Rex.
After the Tyrannosaurus Rex the other deadly dinosaurs are.
Majungasaurus.
Troodon.
Mapusaurus.
Velociraptor.
Utahraptor.
Spinosaurus.
Carcharodontosaurus.
All dinosaurs that roamed the earth millions of years ago were dangerous and it's a good thing that no more dinosaurs are around.
But those above are the top deadly dinosaurs.