A student kneels next to the casket of Columbine High School teacher Dave Sanders RELATED VIDEO CNN's Charles Zewe looks at how family and friends honored the memories of those who were killed at Columbine Windows Media 28K 80K  ALSO: Faith, heroics and bedtime snacks hailed at Columbine funerals A new test ahead for Columbine High School Fatalities at Columbine High Investigators: Gun traced to shooter's girlfriend  MESSAGE BOARD: Colorado school shooting

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LITTLETON, Colorado (CNN) -- A grandfather who made good bedtime snacks, a 17-year-old girl hailed as a Christian martyr, a valedictorian candidate and a hero who died while holding a door open so others could escape -- four more of the 13 victims of the Columbine High School shooting were mourned Monday at separate funerals.

The latest round of grieving began with emotional tributes for Dave Sanders, the teacher and athletic coach praised for actions that saved young lives as he lost his own.

His students, former students, colleagues and relatives repeatedly expressed their love for the 47-year-old father and grandfather who has been hailed as a hero for rushing students to safety after he was mortally wounded.

Two students told mourners at Trinity Christian Center that shouted warnings from Sanders amid the gunfire saved their lives by giving them time to duck for safety.

"He was a hero before that," added Columbine Principal Frank DeAngelis. "He was so unselfish, someone who brought out the best in people. ... He made me a better person."

Several members of Sanders' family spoke at the service, including two of his grandchildren. "He always made good bedtime snacks for me," said a preschooler named Austin, the son of Sander's daughter Angela.

Another daughter, Cindy Thirouin, choked back tears as she read from a poem sent to her by a neighbor.

Columbine High School students sign a basketball as a memorial for Sanders

"You must not tie yourself to me with tears; be thankful for all our beautiful years," it reads in part.

"He is gone from our sight, but never our memories," said a niece, Kim Smith. "Gone from our touch, but never our hearts."

Sanders taught business classes and substituted in the science department at Columbine. He also coached girls' basketball, girls' softball and track for nearly 25 years.

His widow, Linda, did not address the service. Sitting in the front row near her husband's flower-draped coffin, she was presented with a basketball covered with written remembrances from school athletes.

Chris McCauley, another coach at the school, said Sanders is "up there (in heaven), playing basketball. He's the one that's making every free throw ... and having lots of fun."

'Martyr's hall of fame'

Cassie Bernall's strong Christian faith was celebrated during her funeral at the West Bowles Community Church. She was active in Church youth programs and Bible study groups and had recently visited Britain.

Clockwise from top left: Bernall, Sanders, Rohrbough, and Townsend

Some students who survived last Tuesday's attack recounted that when one of the gunmen asked if anyone believed in God, the 17-year-old junior stood and answered that she did. Then the gunman shot her.

"Cassie's response does not surprise us," the family said in a statement released at her funeral.

"Her life was rightly centered around our lord Jesus. It was for her strong faith in God and His promise of eternal life that made her stand," the family said.

The Rev. George Kirsten told the crowd of 2,000 mourners: "Cassie died a martyr's death. She went to the martyr's hall of fame."

'Couldn't conquer her beauty'

At another funeral, the pastor urged mourners to use the tragedy of Lauren Townsend to become the best they can be and to love all types of people as she did.

Townsend, an 18-year-old senior, was the captain of the girls' varsity volleyball team and a candidate for valedictorian. She wanted to become a biologist like her brother Matt.

She was shot to death in the school library, where the worst of the carnage took place.

"People say that Lauren was a victim," said Matt Townsend, 25. "I don't think of her in that way. The ugly thing that happened last Tuesday, they couldn't conquer her beauty."

Saved people he didn't know

Daniel Rohrbough, 15, was remembered as a hero for opening a door to let others escape the shooters. He was shot and died on a sidewalk, just feet away from safety.

"He might have lived if he just made a different choice," the Rev. Dwight Blackstock told about 400 mourners at Grace Presbyterian Church.

"He chose to hold the door for others so they might make their way to safety. They made it. Danny didn't. I doubt very much that Danny would think the word hero applied to him," Blackstock said.

The minister also offered prayers for those students who survived.

"Don't feel guilty," he told them. "Thank God. Just thank God. And thank Danny."

One student who identified himself only as Nick said he didn't know Rohrbough, but owed him everything. "Thank you for saving my life," he said.

Rohrbough had helped his father in his electronics business. He was interested by computer games, stereos and home theater systems.

Services for the remaining student victims are scheduled for later in the week.

Colorado Gov. Bill Owens said Monday that flags will remain at half-staff to honor of the victims of the Columbine High School massacre until Thursday. That's the last day of funerals for the 12 students and the teacher killed by two teen-age gunmen.

Correspondents Carol Lin and Martin Savidge and The Associated Press contributed to this report.