He is taller by about six inches and broke his nose playing football.

He gets good marks in school, having completed almost two grades in one year. He reads a lot in his free time.

These are a few of the things that life has offered Charles "Andy" Williams inside a small cell where a video camera monitors his every movement at Juvenile Hall in San Diego.

The teen at the epicenter of the Santana shooting has caused few problems, his attorney and others said.

When he was arrested, Williams was of slight build – 5 feet, 5 inches tall, 110 pounds. He now stands nearly 6 feet tall and weighs about 150, and he is 16.

He marks his growth on the wall of his one-person cell in Unit 800, the high-security section for youths charged with the most serious offenses. His father visits twice a week, his grandparents, an aunt and uncle once a week.

He has become adept at origami, an ancient Japanese art of making animals and other figures by folding paper.

His father said Andy is severely depressed and struggling to comprehend the strong likelihood that he will spend the rest of his life in prison.

Andy has read nearly 80 books, including one on former middleweight boxing champion Rubin "Hurricane" Carter. Carter spent 20 years in prison for murder until a federal judge freed him on issues including prosecutorial misconduct.

His father once asked Andy what was the difference between him and Carter.

"Hurricane is innocent," he answered. "I'm not."