The images of three youths police say murdered Melbourne baseballer Christopher Lane have emerged.
The Oklahoma teens who face first-degree murder charges have been named as Chancey Luna, James Edwards and Michael Jones.
But their parents yesterday protested their innocence.
Jennifer Luna, whose son is suspected of firing the fatal shot, claimed her son was at home saying: "My son is not that way. My son is a good kid."
Christopher Lane, 22, was randomly gunned down while jogging through the town of Duncan in Oklahoma on Friday afternoon local time.
Meanwhile, Lane's American girlfriend today revealed her heartbreak at losing her "best friend", and parents of the accused protested their innocence.
Sarah Harper, 23, also told the Herald Sun that she didn't know what punishment would be appropriate of the three teenagers, aged 15, 16 and 17 years, accused of Lane's murder.
It comes as Duncan Police Chief Danny Ford said he had secured the confession of the 17-year-old who summoned investigators to his jail cell and claimed he and the younger boys were bored "so they decided to kill somebody".
"He said he was the driver of the car," Chief Ford said.
"They saw Christopher jog by the house they were at, they chose him to be the target, they got in the car, drove up behind him and shot him in the back.
"He said the 16-year-old fired the shot."
The three teenagers are being held in the Stephens County Jail in Duncan.
The trio were due to appear in a local court over the shooting at 1.30pm Monday (4.30am Tuesday AEST), but it has been pushed back a day.
A spokesperson for District Attorney Jason Hicks said the charges were still being reviewed.
Lane, who grew up in Oak Park in Melbourne's north, had only been back in the US for three days after an eight-week break in Australia with Ms Harper.
Two of the accused teens' parents insist they were not involved in the killing.
"That's my baby boy," said the mother of the 16-year-old accused of firing the single bullet from a handgun into the back of Mr Lane.
She doesn't believe her son was involved in the shooting, saying today he was not a member of a gang and definitely not the one who pulled the trigger.
The father of the 15-year-old accused of being in the car admitted his son had been in some previous "kid stuff" trouble with the law, but described him as a good boy who also was not part of a gang.
"I don't think so," the father replied when asked if his son could have been part of the murder.
Lane had been in the US on a baseball sports scholarship with East Central University (ECU) as the team's catcher.
He was jogging through an area of "high dollar homes" after leaving Ms Harper's home, when he was followed and shot.
Witnesses saw him stumble across the road and then go down on his knees before struggling to a drainage area at the side of the road.
A woman who came from a nearby house tried CPR while another woman who was in a car stopped and called 911.