Sean McAllister

"Ian Doyle vanished from prison. Interpol can't find him. He's off the grid, Emily."

"Am I in danger?"

"We all are."

Sean McCallister is Prentiss's former boss at Interpol. He reappeared in Season Six of Criminal Minds.

Background
Sean was tasked with leading a team consisting of Prentiss, Clyde Easter, Tsia Mosely, and Jeremy Wolff. The team specialized with profiling terrorists for Interpol and helping it apprehend them. The team's most notable mission was sending Prentiss, under the alias of Lauren Reynolds, to infiltrate an organization led by terrorist Ian Doyle. After acquiring information concerning the organization's movements from the inside, Prentiss sent it back to Sean and the rest of the team and Interpol arrived at Doyle's residence and arrested him, but not before he realized Prentiss was a mole after watching her being taken away by two Interpol agents. The team was later disbanded for unknown reasons, and Sean moved on like all the rest, while Doyle was sent to a North Korean prison, though most of the team was informed the prison was located in Russia.

The Thirteenth Step
After finding out that Doyle escaped from prison, stabbing a motorist to death and stealing his vehicle in the process, Sean contacted the rest of his team, except for Prentiss, whom he was unable to get in touch with. He began frequently pestering Prentiss with phone calls and text messages, unaware that she was busy on a case. When the unsubs were killed and the BAU closed the case, Prentiss met Sean at a restaurant back at Washington and apologized for not returning his calls. Sean accepted the apology before telling Prentiss that ﻿Doyle escaped from prison and that her life is in danger.

Afterwards, Sean went into hiding in Brussels, Belgium with his wife and daughter (off-screen) and they were all eventually killed by Doyle's team. It is unknown as to how they were killed, but Garcia immediately managed to find out about their murders.

Appearances

 * Season Six
 * "The Thirteenth Step"
 * "Sense Memory"
 * "Today I Do"
 * "Coda"
 * "Valhalla"
 * "Lauren"