An emotional Robert Meyers, husband of victim Tammy Meyers, was at the scene of the standoff.
"There's the animal, a block away," Meyers screamed to TV cameras before Nowsch was apprehended.
Afterward, Meyers told the Associated Press that the family knew Nowsch. He also told the news service that his late wife had given Nowsch money and tried to offer him guidance.
"We know this boy," Robert Meyers told the AP. "I couldn't tell you this before. He knew where I lived. We knew how bad he was but we didn't know he was this bad."
A neighbor of Nowsch told TV news that she heard police over a loudspeaker telling him to come out of the house with his hands up or to at least come to the window so police could see that he was not harmed. His mother said he had threatened to shoot himself.
Another neighbor, Linda Watson, told the Los Angeles Times that it appears Nowsch lived a block and a half away from the Meyers family.
Tammy Meyers, 44, was giving her 15-year-old daughter a driving lesson Feb. 12 when she was involved in a confrontation with another driver. Police initially said Meyers and her daughter had gone home after the incident and were calling for help when a car pulled up and someone inside opened fire.
Police now say that Meyers, after returning home, went out searching for the other driver. She was joined by her 22-year-old son, who had a gun. The pair drove around looking for a gray or silver sedan. Meyers and her son found the vehicle, police said, and followed it for a while before Meyers decided to go home.
When they got home, a silver or gray sedan drove into their cul-de-sac, police said, and someone began shooting at them. Meyers' son returned fire, and the car sped off. Meyers was hit. She died two days later after being taken off of life support, her family said.