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A Federal Way man accused of firing the gun that killed a Seattle father just before a Memorial Day vacation will be charged with second degree murder.

Court documents released Friday revealed intensive detective work done by Seattle Police to track down suspect Andrew Patterson, 20. Metro surveillance video, interviews with witnesses, including Patterson's girlfriend, and cell phone records ultimately led to Thursday's arrest.

Justin Ferrari, 42, was shot in the head on May 24 while driving in Seattle's Central District with his parents and two children. Ferrari died in his father's arms at the scene. The group was preparing to leave town for the weekend.

Witnesses to the shooting told police the gunman and three other men were fighting on opposite sides of East CherryStreet near the intersection of Martin Luther King Jr. Way South just before the shooting.

They said someone called the gunman, later identified by police as Patterson, a bitch, causing him to pull out a handgun and fire three shots.

Seattle Police interviewed a woman who claimed she was on a Metro bus with the gunman, described by multiple witnesses as having corn rows in his hair and wearing a distinct red and black North Face jacket.

Bus surveillance video showed a person matching the description that witnesses also confirmed as the gunman.

Based on those images, detectives with the Seattle Police Gang Unit zeroed in on Patterson as a possible suspect, associated with a group calling themselves the 31 RACKS, known to frequent the Cherry Street intersection. Patterson was identified in a 31 RACKS YouTube video wearing shoes and earrings that witnesses described on the day of the shooting.

Detectives also spoke multiple times with Patterson's girlfriend, and obtained surveillance video from her Federal Way apartment. Police tracked down Patterson's cell phone number and found a cell phone tower on East CherryStreet pinged Patterson's mobile phone four minutes after the shooting.

Patterson was charged Friday, but he will not be arraigned in court until August 2.

Patterson remains in jail on $2 million bail. If convicted, he faces between 15 and 23 years in prison.

Ferrari worked as a programmer at Zillow.

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