Church leaders encourage parents everywhere to be vigilant and proactive in talking to their children about trauma.
The student, who was not publicly identified, was a student at Stoneman Douglas High. It is not clear under what circumstances the student died or whether the apparent suicide is related to last year's massacre.
Parents: "We have to take this seriously"
"Unfortunately, we've learned that the survivors of a traumatic event like a shootout carry a lot of guilt, fears, pressure and even depression," said Ryan Petty, whose daughter Alaina Petty was killed in filming last year.
"As a parent, we just have to assume that your child is not immune to it, your child is at risk, and you need to take that seriously," he said.
Petty said the school district, community leaders, law enforcement agencies and concerned parents met on Sunday to discuss how to deal with trauma survivors.
"Even if everything seems fine, you have to take it seriously," he said. "You have to ask them the questions, have you thought about killing yourself, have you thought about how you could do that?"
Petty said the students were offered resources after filming, including counseling opportunities. But he said there are sometimes stigmas when you get help or that the students just pretend they're alright.
"Unfortunately, some students do not take advantage of these opportunities, and some parents do not understand the risks of anxiety and depression in a post-traumatic environment like a shooting range at school," said Petty.
"So our message is that we parents need to take this seriously, we have to take this into our own hands, regardless of your proximity to the building and whether you've seen the terrible events of the day that cost 17 lives, 17 hurt others, you You are part of a school community and this community suffers. "
The power of peer-to-peer communication
Cindy Arenberg Seltzer, President of the Children's Services Council of Broward County, also attended Sunday.
"I've heard that parents and children say nobody cares, and they want us to continue our lives, and I want them to know that's not true," she said.
"I have just left a room of 60 people who came up on a Sunday afternoon shortly afterwards to show how much they care about."
She said peer-to-peer communication could be a powerful tool as teens could not turn to their parents.
"We want to harness the power of the youth to talk to each other," she said. This can include the use of Instagram, Snapchat, or any other method that "brings tremendous benefits."
MSD students use their experience to help others
In one example of such a network, MSD students have evolved beyond their own community to help other people experiencing trauma.
Parkland students were connected to the Christchurch community when they visited New Zealand for a learning and healing trip last July.
"It's something that has really warmed the hearts of people in my church, and I think it will also warm the hearts of people in Christchurch."
Dakin Andone and Kevin Conlon of CNN contributed to this report.