PRINCE GEORGE'S COUNTY, Md. -- Students at a Maryland high school paid tribute Friday to a teacher fatally shot the day before, allegedly by her estranged husband.

Gladys Tordil WUSA

Police said Gladys Tordil, 44, was killed in the parking lot of High Point High School Thursday afternoon as she waited to pick up her daughters. Her husband, Eulalio Tordil, also wounded a man who tried to intervene. The bystander, who was shot in the shoulder, was expected to survive.

Eulalio Tordil, 62, was arrested Friday afternoon in Montgomery County after allegedly shooting four other people, two of them fatally, outside a shopping mall and a supermarket.

An officer with the Federal Protective Service, which provides security at federal properties, Eulalio Tordil was taken into custody without incident near the supermarket, the scene of the last shooting, authorities said.

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Authorities did not identify the victims of Friday's shootings, pending notification of their families. It was unclear if any of them knew the gunman.

At Parkdale High School in Prince George's County, Gladys Tordil was remembered as a chemistry teacher who was a favorite among students, CBS affiliate WUSA reported. Her classroom door was covered with sticky notes and a giant card after news of her death spread.

One of her daughters' classmates told the Washington Post that Gladys Tordil was "always happy, always singing, always dancing." She was described as the type of teacher who paid out of pocket for bowling and pizza for students who couldn't afford to pay their own way.

A GoFundMe page was set up for her daughters, both high school seniors preparing for college in the fall, with dozens of messages of love and support.

"My niece adored Ms. Tordil," Liz Schartman wrote.

"Gladys was a wonderful lady and she will be missed here at Parkdale," wrote Karen Bogoski.

Michele Seibert had a message for her daughters: "I love you girls and I loved your mother so much."

"Ms. Tordil was a beloved staff member. Students will be deeply affected by her death," Parkdale Principal Tanya L. Washington said in a letter sent to parents. She said the school would be providing counseling to anyone who needed it.

Gladys Tordil sought a protective order against her husband, alleging he had molested two minor children in the home, CBS News investigative reporter Laura Strickler reported. The order, issued for one year beginning March 17, ordered Eulalio Tordil to refrain from having any firearms and to leave his work firearm at his job during non-work hours.

The Federal Protective Service placed Eulalio Tordil on administrative duties in March after the protective order was issued. Authorities said he had threatened to "commit suicide by cop."

He was charged with first-degree murder Friday evening in his wife's death and was scheduled to be arraigned Monday, according to Montgomery County State's Attorney John McCarthy.