[Warning: Potentially Triggering Content] A 21-year-old Tennessee man is off to prison for the next three decades after pleading guilty to shooting and killing his mother five years ago after she took his phone away. On Monday, Shawn Tyler Willis (above, in his mugshot) pleaded guilty to one count of second-degree murder in the death of his mother Sandy Willis (also pictured above, inset) at their home in Rocky Top, Tennessee. As part of the plea, Shawn has been sentenced to serve 30 years in prison.