Las Vegas Terror Murders

[Lauren Johnson]

CNN

(CNN) Breaking News Mandalay Bay security guard Jesus Compos has been arrested accused of being an accomplice and second shooter in the Las Vegas massacre that claimed the lives of 59 people and injured more than 500.

Jesus Campos had originally been praised for his apparent heroics on October 1st, as he supposedly rushed to Paddock's suite, was shot in the upper thigh through the door, and continued to help get people to safety despite his wounds. However, FBI officials involved in the investigation now believe he was an accomplice of Paddock's, and was involved in the initial shooting as a second gunman from the other broken window in Paddock's 32nd-floor room.

According to a senior FBI official, authorities became suspicions by the extreme amount of gunpowder residue found on Campos' hands and inconsistencies in his timeline of events. "We believe he killed Paddock, shot holes through the door and his own arm to produce physical evidence for his cover story, then went and lay next to the elevator," the FBI official told CNN.

An anonymous source working on the investigation told CNN that authorities are now in possession of security footage showing Campos smuggling the firearms used in the massacre in through a Mandalay Bay loading dock in the days leading up to the event.

With the arrest of Compos Police now hope to get a greater understanding of the motivations behind the attack.