Mason Turner

"They were transients and drug users and prostitutes. They were useless to society. I gave them the chance to be part of a cure. To be of use. That's science."

Mason Turner was the quadriplegic brother and partner of Serial Killer Lucas Turner who appeared in the Season Four finale of Criminal Minds.

Background
As a young man, Mason had a promising career as a physician. After graduating from medical school in 2000, he came home to the family farm where he decided he was going to sell it due to the death of his father. Lucas, his brother, became enraged and pushed him from a loft in the barn, paralyzing him. Because of his desire for a cure, it began to twist his mind.

Since that day, he has commanded Lucas to steal medical supplies in order to take care of him. He lays in his bed, surrounded by mirrors that allow him to see everything around the house--inside and out. He also has a voice-activated laptop, with which he dictates his odd theories and makes phone calls.

To Hell and Back, part 1 and 2
Mason is first seen when his brother Lucas brings a young girl to his window to get his approval. Shortly after, the BAU arrives and finds him in bed, helpless. He demands that they leave, and that his home is his business. The team looks around to see that his home is filled with medical supplies, both mundane and unusual. A bloody table is also found nearby.

After a lengthy discussion and the discovery of a bin full of nearly one hundred pairs of shoes, Rossi returns to interrogate him. There are many mirrors in the room where Mason is able to sadistically watch his victims being slaughtered and instruct his brother. Rossi begins by removing Mason's mirrors so that he cannot see what is going on. He tells Rossi that Lucas had pushed him from the loft and that he has been taking care of him. He says that Lucas is helpless without him and that he is inhumanly strong and dangerous. He then tells Rossi, "If you see him, don't try to talk him down. Just kill him."

Rossi discovers that Mason has been instructing Lucas to kidnap victims. He then tells Rossi that there is a photo of Lucas in the other room. Rossi gets the photo and goes outside to relay the info. The local constable is then asked to get a warrant for Mason's laptop. Hotch calls Garcia and asks her to fly in to hack the computer in person, as he does not want to share any info on the phone.

After hacking into Mason's computer, Garcia finds that the kidnappings were performed in order to find suitable "donors" from which to extract stem cells. Mason wants to use the stem cells to cure his paralysis.

Meanwhile, William Hightower, the brother of one of Lucas' victims, is listening outside and hears that, due to Mason's disability giving him a good defense, he would most likely be let off. As Garcia and JJ are getting more info from the laptop, William walks in with an FBI shotgun. He shoots Mason and is arrested.

Appearances

 * Season Four
 * To Hell and Back, part 1
 * To Hell and Back, part 2