One of three men accused of killing a Weslaco doctor pleaded not guilty to murder and aggravated robbery on Monday. 

Luis Antonio Valenzuela, 20, of Weslaco pleaded not guilty to murder, a first-degree felony, and aggravated robbery, a first-degree felony, on Monday morning.

Valenzuela and two other men are accused of killing Dr. John Dominguez, 59, of Weslaco during an attempted robbery.

A follow-up hearing is scheduled for Nov. 18.

Watch the video for the full story.