(CBS/WTSP) It's another school day at King High School, except it begins with one less student. Principal Carla Bruning at the Tampa, Fla. school asked students for a moment of silence in memory of 16-year-old Calyx Schenecker and her younger brother Beau, who police say were murdered by their mother, Julie Powers Schenecker.
Calyx was a sophomore and was described as an ideal student, reports CBS affiliate WTSP.
"Calyx was the model child. She was smart, athletic, cute and had a sense of humor," says Bruning.
Michael Actable ran with Calyx in track and expresses his loss with a t-shirt he made. On the front, there's Calyx's year book picture with her name. On the back, it says, "In Loving Memory."
Other students are wearing ribbons in green and silver. Green was Calyx's favorite color. She loved Harry Potter and started a club based on the book series. Some students wore scarves and capes to school like the main character in the book, in Calyx's memory.
"We've seen lots of hugging, crying, grieving and talking about the fun times they've had," says Bruning.
It was a similar scene at Liberty Middle School, where Calyx's 13-year-old brother, Beau, attended 8th grade. More than 200 students have turned to counselors for help, according to WTSP.
"He was a wonderful kid, well-liked, played soccer," says Jim Ammirati, principal at Liberty Middle School. The principal says many students showed up wearing blue to school, which was Beau's favorite color.
According to an arrest affidavit, Schenecker shot her 13-year-old son Beau in the head twice "for talking back" while they were in the family car on their way to his soccer practice. The report said Schenecker then returned to their upscale home and shot Calyx in the face while the girl studied at her computer.
Investigators believe the teens "never saw it coming," said police spokeswoman Laura McElroy.COMPLETE COVERAGE OF JULIE POWERS SCHENECKER ON CRIMESIDER