Interim Austin Police Chief Joe Chacon described the shooting as a "domestic incident" and said that the victims were known to the shooter. Reyes said Alyssa Broderick, who played on the school's girls basketball team, was also killed in the shooting.
Officers initially found three adults seriously injured on the scene, all of whom were later pronounced dead.
AUSTIN, Texas - Three people were fatally shot in Austin on Sunday and no suspects are in custody, emergency responders said.
ATCEMS tweeted that medics, Austin Fire Department and Austin Police Department crews were responding to a declared active attack/shooter incident in the 9600 block of Great Hills Trail.
Stephen Broderick, 41, was arrested Monday morning around 7:30 a.m.in Manor, Texas, a suburb just east of Austin, KXANreported. "At this point, we do not think this individual is out there targeting random people to shoot".
The Austin Police Department advised residents to shelter in place and avoid the area. He was previously charged with sexual assault of a child and posted bail a year ago.
The Austin-Travis County EMS said it has received no reports of other victims. He said that the district attorney's office on Sunday filed a motion to revoke that bond and is actively supporting law enforcement as they pursue Broderick. He said Broderick was taken to Travis County jail, where authorities did not immediately release more information.
Sheriff's spokeswoman Kristen Dark tells the Austin American-Statesman that Broderick, a property crimes detective, resigned after the arrest. His wife filed for a protective order and divorce shortly after his arrest. Police said a child is safe and with authorities.