Paul Ciancia, the 23-year-old accused of killing a TSA agent and wounding three others in a rampage at LAX last month, pleaded not guilty to murder and other felony charges today. Ciancia faces the death penalty if convicted.

Before being hauled away on a stretcher and sedated on Friday, alleged gunman Paul Ciancia, 23, was able to help investigators by telling them acted alone in his attack of Los Angeles International Airport Terminal 3. Ciancia was shot by law enforcement officials four times, including one shot to the leg and one to…