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Jimmy Fallon made a surprise visit at Marjory Stoneman Douglas High School's graduation ceremony on Sunday, nearly four months after the students survived a shooting that killed 17 of their classmates and teachers.

Graduating seniors at the Florida high school where a gunman killed 17 people in February received diplomas Sunday and heard from surprise commencement speaker Jimmy Fallon, who urged them to move forward and "don't let anything stop you."

Four families received diplomas on behalf of loved ones slain in the attack that gave rise to a campaign by teens for gun control. Principal Ty Thompson underscored the honors for the dead students in a tweet.