On Thursday, police said, Isaac Smith, 19, punched 22-year-old Rodney Smith during a confrontation at South Mountain Community College.
Rodney Smith, like Isaac Smith a former student of the school, then pulled a handgun from his waist and opened fire, according to a probable cause statement released Friday. School officials say 20 to 30 people were in the lab, which is open to the public.
Isaac Smith was trying to hide under a table when he was shot, the court document said. Gonzales said the bullet entered his body through the groin area, traveled through his stomach and into his chest cavity. He underwent emergency surgery overnight and was in critical condition Friday at Maricopa Medical Center.
The other victims, identified as Otisha Charee Williams, 20, and Christopher Lee Taylor, 17, were in stable condition early Friday. Williams and Taylor appear to have been innocent bystanders, police said.
At a court appearance Friday, Rodney Smith pointedly apologized to the "innocent victims" of the shooting after the judge advised him that anything he said could be used against him in court.
"I didn't mean for any innocent victims to get hurt," he said. "I apologize to the innocent victims and their family."
Court documents say the December fight began after a man who was at a gas station with Isaac Smith tried talking to a woman who was with Rodney Smith. Isaac Smith and two others punched and kicked Rodney Smith repeatedly as he lay on the ground
- breaking his jaw in two places - and the woman was punched in the stomach when she tried to stop them, documents say.
The three attackers pleaded guilty to felony aggravated assault. Isaac Smith was sentenced to three weekends in county jail and two years' probation, and was ordered to pay an unspecified amount of restitution to Rodney Smith.
Rodney Smith was arrested soon after the shootings at a home about three miles from campus. He was booked for investigation of aggravated assault, endangerment and misconduct involving weapons; bond was set at $200,000.