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Jabrie Bennett, 18, of Oakland, is wanted in connection with the murder of Kenneth Lee Seets at the Bay Fair BART station Jan. 19. (BART Police)

SAN LEANDRO -- A man sought in a shooting that killed a bystander at the Bayfair BART station is believed to be on the run with his girlfriend, who was wounded when the gunfire broke out between two groups at a bus stop outside the station.

Jabrie Bennett, 18, of Oakland, is wanted in connection with the deadly exchange of gunfire on Jan. 19. Kenneth Lee Seets, a 50-year-old Fremont man, was killed by a stray bullet.

A teenage girl, who was originally reported as a bystander, was grazed by a bullet during the exchange. She was treated at a hospital and released.

On Friday, BART investigators said the girl, identified as 18-year-old Antilea Beal, was on the run with Bennett, whom investigators believe to be her boyfriend.

BART investigators closed in on Bennett's last known residence in East Oakland on Thursday afternoon and found that he had fled, BART police Deputy Chief Ben Fairow said. Beal, who is already wanted on three outstanding warrants issued by the Alameda County Probation Department, also was nowhere to be found.

Two other suspects, a 16-year-old boy and another suspect who has not been identified, were arrested during a traffic stop shortly after the shooting. They are jailed on unrelated weapons charges after guns were found in their car.

Several agencies cooperated in the investigation, Fairow said, including BART police, San Leandro police, the Alameda County Sheriff's Office, Hayward police, Oakland schools police, the California Highway Patrol, Oakland police, the U.S. Marshals Service and the District Attorney's Office.

"There was some great work done on this case," Fairow said. "We can't bring Mr. Seets back, but hopefully an arrest can bring some closure to this family."

Seets and the teenage girl were caught in the crossfire between two rival groups about 12:30 p.m. near the BART station's AC Transit connection area.

The tragic events were felt intensely by AC Transit supervisor Larry Glenn, 58, who was one of the last people to see Seets alive.

Glenn was standing just steps away from Seets, who was sitting on a bench near the station's bus loading zone, when a fellow driver asked for his help fixing a fare machine. Glenn said he had taken only a few steps when he heard shots ring out behind him.

"I heard 20 to 30 rapid-fire sounds" Glenn said. "Thirty to 40 people started running and ducking."

Glenn used his bus's handheld radio to bring emergency crews to the scene.

"I went to the girl first, who had what looked like blood on her white jacket. She said 'I've been shot!' but was alert, and had women with her. Then I was told about the man on the ground."

Glenn ran to Seets, who was lying face-down on the ground with a gunshot wound to his torso.

"He was on his belly facing his right side, his face on the ground in a dirt patch, and all I could hear was (what sounded like) snoring," Glenn recalled. "I kept saying 'Hang in there, they'll be here shortly.' I believe my voice was the last thing he heard."

Seets, who worked as a truck driver for a Hayward-based plastics plant, was pronounced dead at the scene.

Glenn said he was trying to reach Seets' family to express his condolences. He said he cannot get the shooting out of his mind.

"I felt really sad because there's a part of me that ... just, if I hadn't of been called, I would have gotten shot. It's very disheartening," Glenn said. "He was an innocent bystander. I just don't understand the easiness of how these kids do what they do."

Bennett is considered armed and dangerous, and anyone who sees him or Beal should call 911 immediately, police said. Anyone with information about their whereabouts can contact BART police detectives at 510-464-7040 or the anonymous tip line at 510-464-7040.

Follow Erin Ivie at Twitter.com/erin_ivie.