A fourth teenage victim has died after being shot in a fatal school shooting at the Marysville-Pilchuck High School in Washington State last month.

A spokeswoman for the Harborview Medical Center confirmed on Friday that 15-year-old Andrew Fryberg died that evening after suffering from critical gunshot wounds at the hands of his cousin, Jaylen.

"We express our thanks for the amazing support from the community, as well as from everyone around the world that have been praying for us all through this tragic event," Andrew Fryberg's family said in a statement released by the hospital, according to CTV News.

Officials say that Jaylen, 15, opened fire in a crowded lunchroom on Oct. 24, fatally shooting Andrew and three of his friends. He also shot his cousin Nate Hatch, 14, who has survived a gunshot wound in his jaw.

The incident occurred after Jaylen sent a text message inviting his two cousins and three friends to meet him at the school cafeteria. As they were gathered around a lunch table, he used a .40 caliber Berretta to shoot them from behind, killing Zoe Galasso, 14, at the scene, Gia Soriano, who died in the hospital the following Sunday, and Shaylee Chuckulnaskit, 14, who died on Oct. 31, reports Reuters. Jaylen then shot and killed himself.

Hatch, the only surviving victim, was released from Harborview hospital on Thursday and greeted by more than 200 friends and family members who cheered him on from the side of the road as he drove to the Tulalip Indian Reservation.

The Tulalip Tribes also released a statement, saying that they and Marysville "will be forever changed as a result of the senseless and tragic incident that took place on the morning of Oct. 24 and know that healing will not happen overnight. We remain committed to taking this journey together, step by step, holding up the families most impacted and helping our communities heal."

Students at the school described the shooter as a popular and well-liked athlete who played on the school football team. From the looks of his social media accounts, Jaylen appeared to be an avid outdoorsman who took pride in his Native American heritage. He was also named the freshman class Homecoming prince just one week prior to the tragedy. 

Police have yet to identify a motive in the killings, reports NBC News.