What shark regularly eats dolphines sea lions whales and people?

Answer 1

The Great White is probably the Shark you are referring to. They particularly prey on Sea Lions and whilst have been known to eat people, that is generally an opportunistic killing rather than preying upon people. Most often people are bitten and die from the extent of the wound see the URL's below to read some examples recently

http://www.destination-Scuba.com/Shark-attack-fish-hoek.html

http://www.destination-scuba.com/Shark-attack-Australia.html