A Cedar Hills man who admitted to using a gun to rob a teen boy of his hoverboard Tuesday in Southeast Portland later wrote the boy a letter saying he was sorry for threatening his life, court records show.

Kwaleam Pinkly, 20, was arraigned Wednesday on first- and second-degree robbery and unlawful use of a weapon charges, court records show. A hoverboard is a two-wheeled device that's similar to a Segway without handlebars.

The 13-year-old boy told police he and two friends were walking down Southeast Harold Street when they spotted a Honda Accord he thought was suspicious, according to a probable cause affidavit filed Wednesday in Multnomah County Circuit Court. The friends walked to the other side of the sidewalk to stay away from the car, but its driver eventually pulled up next to them.

Pinkly was sitting in the backseat and had his window down, according to the affidavit, and asked the boy if he liked the hoverboard. Pinkly pointed a small, silver revolver at the boy, who thought he was going to be robbed and dropped the hoverboard and ran.

Pinkly then got out of the car and lifted his shirt, exposing a revolver, according to the affidavit. He pointed the gun at both of the boy's friends -- one of whom said she watched Pinkly grab the hoverboard and get back into the car.

An officer who responded to the area pulled over the car near Southeast 96th Avenue and Harold Street. There were five people in the car, and its driver gave police consent to search it. An officer found a silver revolver with a black handle under the front passenger seat, and the boy and his two friends identified Pinkly as the person who pointed the gun at them and took the hoverboard.

Police found the hoverboard in the car's trunk.

Pinkly is being held in the Multnomah County Detention Center on $1,007,500 bail, according to jail records. He's next scheduled to appear in court May 26, court records show.

-- Jim Ryan

jryan@oregonian.com

503-221-8005; @Jimryan015