Alvez was born in the Bronx, New York. Inspired by his father's military service, he joined the U.S. Army and served as a part of the 75th Rangers Regiment in Iraq, as he told Emily Prentiss. After he was discharged, Alvez joined the FBI and worked in several different divisions before being assigned to its Fugitive Task Force, where he became responsible for capturing fugitives on the run. While training with the Task Force, he studied Calvin Shaw, a disgraced former FBI agent convicted of murdering his confidential informant. Later, one of Alvez's targets is a man named Daniel Cullen, a.k.a. "The Crimson King". During the manhunt, the Fugitive Task Force team can't get a positive identification on Cullen during his crimes, so Alvez's partner Phil Brooks goes undercover to lure him out. The operation is a success, and Cullen is recaptured, but not before he tortures Brooks. The incident had traumatized Alvez ever since. Alvez has a dog named Roxy. Because of the affectionate way he talks about her in the office, Penelope Garcia thinks at first she is his human girlfriend.
Character arc
In the Season 12 premiere he works with the BAU to catch the "Crimson King", one of the escapees who attacked his old partner. The team discovers that the real killer is Peter Lewis, aka "Mr. Scratch", who taunts the team by turning over the real "Crimson King", whom Lewis tortured to the point he no longer remembered who he is. After that Alvez decides to join the BAU full-time. Following the tragic events of Season's 12 finale titled "Red Light", in the Season 13 premiere titled "Wheels Up", Alvez appears to be the only team member who is unharmed after a car crash Lewis caused. He is also the one who comforts Garcia, as she was the one who discovers that Supervisory Special AgentStephen Walker. When the team discovers where Lewis is hiding, Alvez, Prentiss, Spencer Reid and Matt Simmons get to the location first. Alvez chases Lewis to the rooftop of the building, but Lewis falls to his death. In the sixth episode of Season 14, title "Luke", four people living in various cities along the East Coast are tortured and murdered over a three-day span, and the BAU is called in to connect the spree to a DEA-Federal Police manhunt for an infamous Mexican cartelhit man. Alvez becomes emotionally involved in the investigation of the case, because of his time spend as an undercover agent on the DEA a few years before. The case becomes personal when the killer, Jeremy Grant, murders Brooks and goes after his girlfriend Lisa Douglas. For that reason, Prentiss takes him out of the case and tells him to go home. Alvez ignores Prentiss' orders, however, and helps the BAU team catch Grant. After This Lisa breaks up with him. In the 5th episode of season 15 Alvez and Simmons are kidnapped. They outsmart their kidnappers and are saved by the team. In season 15 episode 10 that’s the last episode in the series at Penelope Garcia’s goodbye party Alvez aka her since they will no longer be working together would she want to go out with him. She gets happy and says yes. Throughout Alvez’s time on the show Garcia and his relationship has been bickering and caring.
