Snohomish County investigators explained Monday what led them to arrest a Marysville man in the shooting death of a 15-year-old Seattle girl last month.

Molly Conley was visiting friends in Lake Stevens and celebrating her birthday June 1 when she was struck in the neck by a bullet. Several of her classmates were with her at the time.

Erick N. Walker, 26, was arrested at his Marysville home Friday. He was booked for investigation of first-degree murder, drive-by shooting and assault with a weapon.

According to probable cause documents, there were other reports of shots fired at homes in the same general area as the Conley shooting. At one of those scenes, a vehicle was allegedly hit by the suspect vehicle.

Paint chips from the damaged victim vehicle were sent to the Washington State Patrol crime lab to determine what kind of vehicle had hit it.

Investigators cross-referenced that with recent purchases, at the Tulalip Cabela's, of the type of weapon they believed was used in the shootings -- a 30 carbine caliber. That ultimately led them to Walker.

The probable cause documents show investigators learned from Walker s Facebook page that he worked at Boeing. After contacting the company to confirm Walker worked there, detectives found a vehicle in a Boeing parking lot that was registered to Walker. It was similar to the one they were looking for. The vehicle allegedly showed signs of damage consistent with what happened on June 1.

The Snohomish CountySheriff's Office has not yet revealed a motive for the shootings.

Investigators say four police agencies were involved in the case. A dozen witnesses provided information.

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