Pacific Police have arrested a 19-year-old Algona man on suspicion of murder in the killing of a 13-year-old boy at the Cobble Court Apartments Friday.

Pacific Police Department spokesperson Stephanie Shook said police were called to the Cobble Court Apartments complex at 600 Ellingson Rd. around 3:02 a.m. Friday morning after receiving a call from a man who said his son and 16-year-old daughter were missing.

When police responded they found the boy dead in a bedroom at the apartment.

The teenage girl was later found at the residence of a 19-year-old Algona man and transported to a local hospital with unspecified injuries, Shook said.

At a press conference at the Pacific Public Safety Building at 2 p.m. Friday, Lake Forest Police Detective Tony Matthews of the Major Crimes Task Force – an organization of 11 local cities in South King County, including Pacific and Algona, which assists smaller police departments in investigating major crimes like homicide – said the investigation is still in progress.

“(The Algona man) was moving from different locations throughout the night, and that’s the reason we’re going from place to place,” Matthews said. “We’re trying to talk to everyone he came in contact with starting yesterday afternoon until the time of the incident,” Matthews said.

Investigators said they’re not looking for any other suspects.

At the Cobble Court apartments, downstairs neighbor Maria Venegas said she heard a commotion from the apartment beginning around 11 p.m. Thursday.

“We just heard a lot of noise last night,” she said. “(It sounded) like screaming and something broken very hard. We couldn’t sleep… I thought it was just fighting, we didn’t know someone was killed.”

She added that the family – the two teenagers, a stepfather and the childrens’ biological mother – moved in about a month ago.

Venegas’ son Luis Venegas, 9, said the sounds of fighting woke him up.

“They were fighting and it sounded like something fell down and hit the ground hard,” he said. “I was asleep and I got woke up. One of them was saying they were going to call 911.”

No details on the cause of death have been released, but Matthews said they were searching for the murder weapon. He added that the suspect was being transported to the Regional Justice Center in Kent and would likely be charged with first degree murder.

The victim was reportedly a seventh-grader at Mount Baker Middle School.