Robbery Riddle

Somebody broke into a collector's house and the world's most famous and biggest diamond was taken. Inspector Smithy interviewed three suspects after the burglary. He knew it was a one-man job.

The inspector also knew that each suspect told him one false and one true statement.

Slick Jim said: “It wasn’t me. And Burglar Bill didn’t do it.”

Burglar Bill said: “It wasn’t me. And it wasn’t Dodgy Dick.”

Dodgy Dick said: “I didn’t do it. And Slick Jim and Burglar Bill were at the races with me.”

The inspector knew immediately who the burglar was and arrested him.

Who did the inspector arrest?