Grainy cell phone video captured in a residential neighborhood in Yona Monday night.

The video shows the moment the man who Guam police believe shot and killed a Korean tourist in Tumon turned the gun on himself.

The disturbing video circulating on social media today. Officers were heard saying man down and calling for a medic.

Authorities later confirmed their suspect, Keoki Santos, who died by suicide.

Court documents filed in Superior Court today against defendant Stefen Camacho stated Santos was aware that Camacho had been taken into police custody just moments earlier.

Authorities found text messages that Santos had sent to a witness stating, “Delete Stefen from your phone."

The pair are accused in the Jan. 4 armed robbery on Gun Beach Road in Tumon that claimed the life of an elderly man visiting from Korea.

Prosecutors identified the victim as Hea Jun Hwang. He was celebrating his retirement with his wife.

The only living suspect is now charged in Superior Court.

Camacho appeared before a magistrate judge facing charges of complicity to commit aggravated murder, complicity to commit robbery, both with special allegation vulnerable victim enhancement.

Camacho allegedly admitted to police that he and Santos lost $100 at the gameroom that night before the pair drove to Tumon with a plan to rob tourist.

Following the deadly encounter, the duo allegedly split $75 each before getting rid of the rest of the victim's stolen items.

Camacho is being held on $1-million cash bail.

Prosecuting Attorney Sean Brown told the court, “Not only was the victim a tourist, he was also about 60-years-old. So, there are two ways they targeted a vulnerable individual...because of that, they brought a firearm with them to conduct the robbery in Tumon, this was a planned, orchestrated endeavor and for this reason, Your Honor, two lives were lost"

If convicted, Camacho could face life behind bars.