Many students at Moanalua High returned to school with sadness in their hearts, after senior Leighton Mow died on Labor Day at a popular pond and waterfall.
Kapena Falls was quiet and tranquil the day after Mow's death.
No crowds of people swimming and jumping into the water at the popular falls.
Instead, flowers have been laid at the top of the rocks overlooking the pond.
The pond is where Mow's body was found, after he had been missing for hours.
The flowers were a small memorial, left to remember a special Moanalua High School senior.
"He was a good guy, always smiling. He had so much ahead of him. He was a smart kid. He always worked hard even when people told him he can't do it -- he did it," said Moanalua senior Cody Azuma.
Mow was a member of the Na Menehune baseball team. After his death, his teammates talked about playing their sport without him in the lineup, but that he would remain in their hearts.
"We're going to play for him, the rest of the year. Pretty sure for the rest of our careers, we are going to remember him. I'm sad to see another one from the Moanalua baseball program go"," stated Azuma.
Just three years ago, the team was playing for Zach Manago, who had graduated from Moanalua in the spring and was killed by a hit-and-run driver that winter. Now, Mow will hold a special place with the team and other students and teachers at the school.
"He'll be remembered. We've had past experiences like this and we've done things in memory of them," said Moanalua sophomore Kevin Davey.
What will fellow classmates remember the most about the 17-year-old?
"He's not really outspoken, he was always a calm and mellow kid. He's super happy, and had a nice smile -- that's what people liked about him," said Moanalua senior Bryson Chan.
Because of the death, Moanalua school had counselors on campus to talk to students about their grief.
Students also gathered after classes to say a prayer for Mow. After the teenager's sudden death, it also gave some a chance to say goodbye.
"Students took it really hard. But I think it was good that we were able to come together to remember him," said Chan.
"We're all family at Moanalua. It is so sad that Leighton had to leave us," said Azuma.
Even though Mow's body was found underwater at Kapena Falls, the medical examiner has not yet determined why the teenager died.