Gary

Gary (last name not revealed) is a serial killer who appeared in Children of the Dark along with his partner-in-crime Ervin Robles.

Background
Gary and Ervin grew up together raised by Mr and Mrs Manwaring in a foster home where they were frequently abused. Gary, who took the worst beatings, eventually became a charming, manipulative sadist. He left the day he turned 18. The two became professional criminals, performing home invasions together. One night, during a routine job targeted at the Laybourne family, they noticed that the parents had been abusing their daughter regularly. As a result, Gary flew at them in rage, tied them up and beat them to death with an iron. Ervin then killed the daughter as an act of mercy, establishing their M.O. and view on family households. Inspired, Gary wanted to return to their foster home and kill their foster parents, but Ervin wouldn't let him. Instead, they started killing other families.

Children of the Dark
The BAU were called in after Gary and Ervin's third home invasion. During the Ortiz' murders, Ervin made a mistake when he tried to kill the daughter, who bore a striking resemblance to his biological sister, resulting in her surviving. He was later arrested and told them about the abuse he and Gary had suffered. Realizing that Gary's murders were rehersals for what he wanted to do with the Manwaring's the BAU headed to them. Meanwhile, Gary was waiting for the couple's current foster children, Tyler and Sara, outside their school. Building trust by displaying knowledge of their household, Gary took them to a donut shop. The authorities tracked his car down and received a message from Gary delivered by Sara, threatening to kill Tyler if they entered. When Hotch called Gary, he surrendered almost immediately. After hearing from the donut shop clerk that Gary had a gun when he walked in, but not when he walked out, Derek and Prentiss, who were driving Sara and Tyler back, heard a gun shot from inside the house; Gary had given Tyler the gun so he could kill the Manwarings. Fortunately, Tyler wasn't able to kill her. Derek then talked him into handing the gun over, promising that he and Sara would be allowed to leave and never have to return.

Modus Operandi
Gary and Ervin would use devices to block out their victims' cell phones, sabotage the lights and cut off their other phones and alarms. After that, Gary would knock on the house's front door carrying a dead animal obtained by Ervin through his job, claiming to have found it outside. With the door open, he would let Ervin in as well. After that, they made the children watch Gary tie up and brutally attack the parents using some object from the house. They would also kill the family's pets if they had any. They would then take some small valuables from the house, such as cash and jewelry.

Profile
Gary and Ervin together were profiled to be mid-to late 20s, most likely white, intelligent and organised. At least one of them has served time in jail for home invasions, but they do not look like convicts and will be clean-shaven and well-dressed in order ot to arouse suspicion. They most likely enter using some kind of ruse and share a compulsion to kill, but have very different personalities. Of the two, Gary, the dominant partner, was sadistic, remorseless and extremely volatile.

Known Victims

 * A number of victimless home invasions performed together with Ervin
 * The Laybournes (were beaten with an iron)
 * One unnamed couple of parents (were stabbed with a kitchen knife)
 * The Halberts (were beaten with a golf club)
 * The Ortiz' (were beaten with a fire poker)
 * The Serranos

Appearance

 * Season Three
 * Children of the Dark