Federal Way police have arrested a 14-year-old boy suspected of stabbing a woman in the torso on Halloween night.

Officers arrested the boy at his Federal Way home just before midnight on Thursday, Nov. 3.

In interviews with detectives, the boy confessed to stabbing the woman and “provided details only the suspect would know,” according to a Federal Way Police Department announcement.

Witnesses say he attends Sequoia Middle School.

Police obtained a search warrant for the suspect’s home and found his clothing, backpack and a stainless steel kitchen knife with a black handle and grey specks, all evidence of the crime.

The suspect was booked into the King County Youth Center for first-degree assault. Formal criminal charges are pending.

Officers responded to the 31900 block of 14th Way Southwest at approximately 9 p.m. on Oct. 31.

According to the search warrant affidavit, at 8:56 p.m., the victim was with her boyfriend when their doorbell rang several times in a row. She went to open the door, “believing it was a trick-or-treater for Halloween candy,” but no one was there. She opened the door, said “hello” and shut and locked the door.

Then she noticed the suspect standing outside.

“[The victim] thought the person on the door was a trick-or-treater who must have heard her from around the corner and come back,” the affidavit states. “[The woman] opened the door with a bowl of candy.”

Offering him two pieces of candy, she noticed the boy had his right hand behind his back.

Suddenly, the boy reached toward the bowl with his left hand, stepped on the threshold of the door with his right foot and took his right hand from behind his back. In that hand was the kitchen knife.

The boy stabbed the woman in her ribs on the right side of her body.

The woman screamed and sat on the living room carpet before being taken to Harborview Medical Center for non-life-threatening injuries.

Police conducted a K-9 search of the area but could not initially locate the suspect.

On Nov. 3, the father of a friend of the suspect called police to report he had information about the stabbing. Both the suspect’s friend and his father told police the suspect pulled his friend to the side on the morning of Nov. 1 and said he wanted to tell him something privately as “he was the only person he could trust.”

The suspect told the witness details of the stabbing. When asked by police, the witness guessed the suspect had used a knife because a friend told him the suspect had “brought a knife blade to school previously.” He also told police the suspect was “proud” of the stabbing and said the weapon was in his room.

After officers arrested the boy, he provided a post-Miranda recorded statement. The suspect described what the woman looked like, how he stabbed her and what he stabbed her with. He described the clothes he was wearing and where they could be found.

Police seized his cell phone and his green Calvin Kline backpack.

The suspect’s motive for stabbing the victim is unknown by the Mirror at this time.

The suspect’s arraignment is scheduled for Nov. 9 in juvenile court.