Albert, Barney, and Curtis were questioned about the murder of Dwight. Evidence at the scene of the crime indicated a lawyer might have been implicated in Dwight's murder. Each suspect made two statements, as follows:

• Albert said he was not a lawyer and that he did not kill Dwight.
• Barney said he was a lawyer and he did not kill Dwight.
• Curtis said he was not a lawyer and a lawyer killed Dwight.

The police subsequently discovered that only two of the statements quoted above were true, and only one of the three suspects was not a lawyer.

Which of the suspects killed Dwight?