A trial is underway for a man who admitted to killing his wife and two girls. The defense has begun presenting its case, calling a doctor to testify about the defendant's medical complications. The doctor's testimony is being used to argue against a death sentence for the defendant, Alberto Sierra.

Further details about the trial and the defense's strategy are available from the source. The defense is seeking to persuade the court that Sierra's medical issues warrant a sentence other than death, but no additional information is provided about the specific complications or the trial's progress.