Chibuko, 40, and a mother of three, worked as a lawyer in Nigeria before migrating to the United States in 2002 after marrying a fellow Nigerian, who is based in the state of California.
"She was a very happy person, very caring, very loving," said husband of the diseased, a technician at AT&T.
"She liked to spend time with her family. Right now I'm just trying to grieve."
Doris, who worked part time at Villa Fairmont Mental Health Rehabilitation Centre in San Leandro, was two months away from graduating with a degree in nursing before the gunman killed her and six others in Oikos University in what has been described as one of the worst school shooting incidents in California.