Spencer Wallis

Spencer was a Witch, and seeming friend of James Frampton, however he was secretly working agaist him.

Biography
Spencer was a local Witch in Saint Louis, and (at least seemed) to be relatively hamless, however he was bitter at James for getting Portia as his Familiar, because he wanted her, however he accepted this, till he learned the two had began having a sexual relationship, which was "agaist the rules." Agravated at James's sacrilige, Spencer turned on him, first beginning several bloody murders, and sending the images to James, so he thought he was the one doing the murders. He also forced his Familiar Phillipe to pose as an eyewitness to identify James to Ed, a local police officer who had a grudge against James. Thus enacting his sinister plan, first turning James agaist himself, and then the Local witches, who would not risk themselves if James was caught by the police. All the while he posed as a supportive friend of James.

However his plan hit rocks, when Portia invited Sam and Dean Winchester into investigate, Spencer managed to throw Dean off the scent, by claiming that such a spell to take control of a witch was impossible, succeeding in convincing them that James had simply lost control. However Portia again managed to convince them James was innocent. Upon learning that it was Philippe who was identifying him, James stormed Phillipe, who managed to tell James the truth before Spencer killed him.

Spencer went onto explain the remainder of his motives, and chastise James for what he did. Sam and Dean confronted him, but being a powerful witch, he took them on. James tried to use his own powers agaist him, but Spencer proved to be the stronger Witch, and casually overpowered and almost killed James. He also managed to stop Sam and Dean, by forcing them to relive a section of there worst memories. However Portia (in dog form) ambushed him, causing him to lose concentration, freeing them. She distracted them long enough for Sam and Dean to prepare the Witch Killing Spell that Bobby had taught them and use it on Spencer, reducing him to pool of blood.

Powers and Abilities
Spencer was a very powerful witch, and was held in high regard by other witches, he was able to almost casually overpower James, who was also a powerful witch.
 * Magic - Spencer was highly formidable at magic, knowing many rare and complicated spells, such as one that implanted memories into another's mind. He was able to casually shrug off James's magic attack, and was able to make Sam and Dean relive there worst memories to prevent them from stopping him.
 * Telekinesis - Spencer was highly skilled with Telekinesis, able to snap his Familiar's neck, throw both Sam and Dean at once, and lifts James several feet into the air, all the while choking him.

Trivia

 * Spencer is the second Witch, that Sam and Dean have killed specially by themselves (although they still need Portia's help to distract him).