A total of 17 people are confirmed to have died and more than a dozen were injured after the attacker opened fire at Marjory Stoneman Douglas High School in Parkland on Wednesday afternoon.
The teenager was among the fatalities, with her soccer club reporting on Facebook “with great sadness” that the “beloved” Alyssa had not survived.
“Alyssa Alhadeff was a loved and well-respected member of our club and community,” Parkland Travel Soccer wrote. “Our thoughts and prayers go out to her family and all the other victims of this tragic event.”
A note from her family on the same post added: “To Alyssa’s friends honor Alyssa by doing something fabulous in your life. Don’t ever give up and inspire for greatness,” it read. “Live for Alyssa! Be her voice and breathe for her. Alyssa loved you all forever!”
Her mother said: “All she had to offer the world was love… I just sent her to school and she was shot and killed.”
One of the first victims of the massacre to be named was Jaime Guttenberg, after family members confirmed she had died in the “senseless” killings.
Marc Pollack said his cousin Jaime, who attended the school where the shooting happened, was an “awesome young girl” in a Facebook post following the attack.
He wrote on Facebook: “This is a picture of our sweet cousin Jaime who was senselessly and tragically killed today at Stoneman Douglas High School.
“My heart is broken from the loss of this awesome young girl and the pain that our entire family is enduring.
“Jennifer Bloom Guttenberg, Fred Guttenberg and Jesse Guttenberg, we are all here for you. The love and strength in our family runs deep and you guys are not alone.”
Martin Duque Anguiano
A friend of student Martin has described him as “one of the nicest people I know”.
Isaac Briones said he last saw Martin on the day of the shooting, and that they had spent some of the day “just playing around, talking about jokes and stuff”.
He posted a photo on Instagram of the boys together, saying “I love brother Martin you’ll be missed buddy. I know you’re in a better place. Duques forever man I love you junior!!! R.I.P Martin Duque!”
His brother Miguel posted a photo of Martin on Instagram and said: “Words can not describe my pain. I know you’re in a better place.”
The 17-year-old swimmer was commemorated in a Facebook post by his swimming club.
“He was an amazing person as well as a great swimmer. A happy young man who embodied the values of our program,” the club wrote.
“A young man who had changed his life recently and was on a major up swing in his life.”
He was due to attend the University of Indianapolis, and the president said: “Nick’s death is a reminder that we are connected to the larger world, and when tragedy hits in places around the world, it oftentimes affects us at home.
“Nick was a recruited athlete to our swim team.
“Nick’s death also reminds us of the far-reaching impact of these national acts of violence.”
An athletic director at Marjory Stoneman Douglas High School also died in the shooting.
Christopher Hixon, 49, was a member of the Roman Catholic Church and the Archdiocese of Miami confirmed his death.
He had taken a job patrolling the grounds of the school as a security specialist, and in this capacity came within the gunman’s range.
A friend posted on Facebook: “You were a great shipmate, sailor, friend, and patriot.”
The 14-year-old was announced to have died by the Mormon Church, where she was a member.
The Church of Jesus Christ of Latter-day Saints said Alaina Petty was among the deceased, and that 17-year-old Madeleine Wilford, another member of the church’s Coral Springs congregation, was wounded.
“Once again we find ourselves as a nation and as communities faced with a tragic loss of life and incomprehensible sorrow,” the church said.
“We unite our prayers with millions of others who are mourning and praying for them.”
Her aunt wrote: “There are no hashtags for a moment like this, only sadness.”
She was also a member of the Junior Reserve Army Officer Training Corp, and volunteered in the aftermath of Hurricane Irma.
Her family said: “Alaina was a vibrant and determined young woman, loved by all who knew her. Alaina loved to serve.
“Alaina was part of hundreds of volunteers that rushed to the most heavily impacted areas of Florida to clean up and help rebuild the lives of those devastated by Hurricane Irma. Her selfless service brought peace and joy to those that had lost everything during the storm.
“While we will not have the opportunity to watch her grow up and become the amazing woman we know she would become, we are keeping an eternal perspective.”
Football coach Aaron Feis was among those who died trying to save students after he reportedly used his body as a shield against the bullets.
The 37-year-old has been hailed a hero after he tried to stop the gunman killing youngsters at the school.
One student, who called herself Angelica Losada, posted a picture of the coach with a baby, adding: “This, ladies and gentlemen, (is) the face of a hero.
“Coach Aaron Feis was injured protecting a student in the shooting at Marjory Stoneman Douglas High School and, at last report, is in critical condition.
“He is a friend to all students that know him. He was always so nice to me when I went to school there, and I know he is close with my brother and his friends.”
Despite initial reports suggesting he was in a critical condition, Mr Feis died in hospital.
Eighteen-year-old Meadow Pollack had plans to attend Lynn University, her family said.
The girl’s father confirmed she was among those killed on Wednesday. Her parents reportedly called her phone repeatedly but only heard it ring, and kept vigil outside the school.
“An angel was taken away from us in that horrific tragedy,” family friend Adam Schachtel said on Facebook. “No words can be said so just prayers and sadness.”
Another friend called her a “kind and beautiful soul inside and out”.
Friends said Joaquin Oliver was among the students killed in the shooting.
Nineteen-year-old Tyra Hemans said they had been friends for several years.
She was outside the school on Thursday holding up two signs, one about gun control and the other about coach Aaron Feis and Joaquin, widely known by his nickname, Guac, short for guacamole.
Ms Hemans said she last saw her friend at school on the day of the shooting.
Earlier, Oliver’s sister, Andrea Ghersi, shared a photo of her brother on Facebook and wrote he was missing after the shooting. The post was shared more than 8,500 times.
A 35-year-old geography teacher was killed after he helped students enter a locked classroom to avoid the gunman.
Scott Beigel was credited with saving their lives.
Pupil Kelsey Friend told Good Morning America he had unlocked a door for students after gunshots were heard.
“I thought he was behind me, but he wasn’t. When he opened the door he had to relock it so we could stay safe, but he didn’t get a chance to.”
Friend Kurt Perry wrote: “There is a deep hole in many of our hearts at the moment and emotions run high, just remember Scott was the kind of man that would reach for a joke before anger and a calming presence before strife.”
The 15-year-old freshman loved sport.
He played basketball and wanted to try out for the schools’ American football team, his grandmother told Fox Carolina.
His aunt wrote on Facebook that he had been discovered on the third floor.
“This has devastated our family and we’re all in shock and disbelief. Our hearts are broken,” Tony Stroud Brownlee wrote.
“Luke was a beautiful human being and greatly loved.”
Talented musician Alex, 14, played trombone in the school marching band.
He lived with his father, Max Schachter, after his mother died when he was just five-years-old.
Mr Schachter said his son was “a sweetheart of a kid” who “just wanted to do well and make his parents happy”.
His older brother, who is also a student at the school, survived the shooting.
Peter was in the Junior Reserve Officers’ Training Corps (JROTC), training to be an officer in the US Armed Forces.
The 15-year-old was holding a door open to let other students out before him.
His cousin, Lin Chen, said: “He is so brave. He is the person who is genuinely kind to everyone.
“He doesn’t care about popularity. He always like to cheer people up.
“He is like the big brother everyone wished they had.”
Peter was the eldest of three brothers and their parents were preparing to celebrate Chinese New Year’s Eve on Thursday at their restaurant in West Palm Beach.
The 14-year-old volunteered as a friend for children with special needs.
She was a flag spinner as part of the marching band’s winter guard.
Her instructor called her “the sweetest soul ever”.
Jennifer Montalto, her mother, wrote on Facebook: “Our beautiful daughter, Gina Rose, was taken from us during the tragedy at Marjory Stoneman Douglas High School.
“She was a smart, loving, caring, and strong girl who brightened any room she entered.”
The 18-year-old was due to go to college next year.
She was “smart, kind hearted and a thoughtful person”, a relative posted on Facebook.
“Though she was some what reserved, she had a relentless motivation towards her academic studies, and her soft warm demeanour brought the best out in all who knew her.
“She was so brilliant and witty, and I’m still wrestling with the idea that she is actually gone,” the post said.
Top student Carmen was a 2017 National Merit Scholarship semi-finalist.
She was “the smartest and most intelligible 16-year-old I’ve ever met”, her cousin Matt Brandow said on social media.
“You’ll be remembered forever,” he added.
Jeff Ostroff, whose daughter Jenna was friends with Carmen, said: “Words cannot express how sickened and shocked we were to learn that our fellow piano student, 16-year old Carmen Schentrup, was one of the lovely angels who became a victim of the Marjory Stoneman Douglas High School shooter in Parkland, FL, yesterday, and that Carmen left this life yesterday for a better life in heaven with our Lord.”
He said he had recently seen her at a recital, and said: “She had a bright smile on her face after playing. I’ve also had the honour of playing on the roster with her at several piano recitals over the last couple of years.
“Carmen was a 2017 National Merit Scholar semi-finalist as well, and had so much promise.”
Beach-lover Cara was 14-years-old.
Her aunt, Lindsay Fontana, wrote on Facebook: “We are absolutely gutted.
“While your thoughts are appreciated, I beg you to DO SOMETHING. This should not have happened to our niece Cara and it cannot happen to other people’s families.”
Her devastated parents were told she had died at 2am on Thursday, after calling for help to find her.