A 16-year-old girl and 15-year-old boy were shot multiple times in the 'execution position' over a dispute about a stolen purse, police have said.

The fresh details in the March 12 slayings in Colorado Springs emerged on Thursday, when a court released warrant affidavits for the five suspects charged with killing Derek Greer and Natalie Partida.

Charged with first-degree murder are Gustavo Antonio Marquez, 19; the alleged triggermen Diego Carlos Chacon, 19, and Marco Antonio Garcia-Bravo, 20; and alleged co-conspirators Alexandra Marie Romero, 22, and Joseph Arthur Rodriguez, 18.

The fatal events were triggered when Rodriguez accused Natalie of stealing his girlfriend's purse at a house party, according to police.

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The bodies of Derek Benjamin Greer, 15, (left) and Natalie Partida, 16, (right) were found by the roadside in Colorado on Sunday

Alleged Triggermen: Marco Antonio Garcia-Bravo, 20, aka 'Diablo' (left) and Diego Carlos Chacon, 19, aka 'Diablo' (right) allegedly killed Derek and Natalie 'execution style'

Crime Scene: Derek and Natalie were found shot dead on this stretch of Old Pueblo Road

Marquez told investigators that he was with Chacon, aka 'Casper', and Bravo aka 'Diablo' when the trio picked up the two victims and took them to Rodriguez's home on March 11.

Confessed: Gustavo Marquez, 19, admitted his involvement to police

Derek Greer was apparently brought along simply because he was a friend of Natalie.

Rodriguez threatened them with a crowbar before the victims were bundled back into the car, according to the affidavits.

In the car, 'Casper' held a gun to Natalie's stomach as the young girl begged for her life, Marquez told police.

'Diablo' handed the girl a cell phone and offered her a chance to say goodbye to her family, but then grabbed it back and said 'you lost your chance' when she didn't log into Facebook, Marquez said.

When they got to a remote stretch of Old Pueblo Road outside of Colorado Springs, Marquez said the teen victims 'were forced to take the "execution position"', according to the affidavits.

Marquez said that 'Casper' shot Natalie twice and then handed the gun to 'Diablo' who shot Derek multiple times.

Alleged Co-Conspirators: Joseph Arthur Rodriguez, 18, (left) accused Natalie of stealing his girlfriend's purse. Alexandra Marie Romero, 22 (left) was present during the abduction

The cause of death remained sealed until Thursday when police revealed that Natalie (pictured) and Derek had each been shot multiple times

Police recovered five 9mm shell casings at the murder scene.

The trio then drove to a gas station to establish an alibi, police said.

When the trio returned to Rodriguez's home, they allegedly told Romero that things 'got out of hand'.

'They are gone! Diablo did one, and I did the other,' 'Casper' allegedly said.

Police say that cell phone data and surveillance footage corroborated Marquez's confession.

Colorado Springs School District 11 spokeswoman Devra Ashby said the teens were both students at Coronado High School in Colorado Springs. Derek was a freshman and Natalie was a sophomore.

Just days before they were found murdered, Natalie announced on Facebook that she was being sent back to a juvenile detention center but hoped to get her life back together

Natalie and Derek appear to have been friends and would chat to each other on Facebook

Natalie and Derek appear to have been friends and would chat to each other on Facebook.

Just days before they were found murdered, Natalie announced on Facebook that she was being sent back to a juvenile detention center.

The troubled teen was incarcerated in January, according to her own posts, for an unnamed offence after she turned herself in.

But before she was killed she wrote that she hoping to get her life together after she got back from the center.

'Man I got to do it for my moms an me got to start my life an get my s*** together jail ain't fun but neither is waiting around,' she wrote.

Meanwhile, friends and family had expressed concern for Derek in the months before the murders.

Gwendolyn Pate Ponder wrote: 'You just seem so down and out. Like your world crashed around you. I don't like that. Be happy. Smile.'