LAS VEGAS (AP) -- O.J. Simpson's defense has rested after calling one witness on the former football star's behalf in his armed robbery and kidnapping trial in Las Vegas.

Simpson himself didn't testify. His only defense witness was his close friend Thomas Scotto.

Lawyers for co-defendant Clarence "C.J." Stewart say they intend to call three or four witnesses and haven't decided whether Stewart will testify.

Scotto testified Wednesday that two key prosecution witnesses tried to extort $50,000 from him, and that one of them offered to change his testimony if he was paid.

Prosecutor David Roger accused Scotto of threatening to take out a contract on the life of one of the witnesses. Scotto called that "ridiculous."