One Goh's life was on the skids even before he was arrested in the nation's biggest mass school shooting since Virginia Tech.
He was chased by creditors. He grieved the death of his brother. In January, he was expelled from Oikos University, a small Christian school where he studied nursing. And, police say, he was angry.
Goh, 43, who was born in South Korea, told police he felt disrespected when he was teased about his poor English skills at the Oakland school -- a college founded as a safe place where Korean immigrants could adjust to a new country.
So, he bought a gun, and a few weeks later took his revenge, opening fire at the college on Monday in a rampage that left six students and a receptionist dead and wounded three others, authorities said.
"It's very, very sad," police Chief Howard Jordan said. "We have seven people who didn't deserve to die and three others wounded because someone who couldn't deal with the pressures of life."
Police have released little background information about Goh, other than to say he had become a U.S. citizen.
Since his arrest at a supermarket near the school soon after the shooting, the details of his life that have emerged suggest a man struggling to deal with personal and family difficulties over the past 10 years.
Though records list an Oakland address for Goh in 2004, he lived for most of the decade in Virginia. That state was the site of the Virginia Tech massacre that killed 32 people in 2007. That gunman was a mentally ill student who turned the gun on himself.
Online records in the two Virginia localities where he lived show that he racked up tens of thousands in liens and judgments, including a $10,377 debt to SunTrust Bank in 2006.
His brother was an Army sergeant stationed in Germany who died in a March 2011 car crash while attending Special Forces selection training in Virginia, according to the military newspaper Stars and Stripes.
The same year, Goh's mother died in South Korea, where she had moved, her former Oakland neighbors told the San Francisco Chronicle.
It's unclear how Goh earned a living before he became a nursing student at the private school of about 100 students in Oakland. But in January, Goh was expelled. Oikos officials have not said publicly what led to his expulsion.
Around 10:30 a.m. Monday, after planning the attack for weeks, Goh arrived at the school in an industrial park near Oakland's airport, police said. Upon entering the building, Goh was intent on finding a female school administrator who wasn't there, Jordan said.
Goh then accosted the receptionist, marching her to a classroom, he said.
Goh "started ordering people to stand up, started yelling at them," the police chief said. "They started freaking out. He asked them to line up. Some did, some didn't, and that's when he began to shoot."
By the time police arrived, five of the victims were already dead. Two died later in the day at the hospital.