Northern Illinois University marks 15 years since deadly mass shooting

Tuesday marks 15 years since the deadly shooting at Northern Illinois University. 

Students Gayle Dubowski, 20; Catalina Garcia, 20; Daniel Parmenter, 20; Julianna Gehant, 32; and Ryanne Mace, 19, were killed Feb. 14, 2008 when a gunman entered an ocean sciences class and began shooting

Twenty one more people were wounded before the shooter turned the gun on himself.

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The families of the victims asked the university not to hold any ceremonies today.

The Associated Press contributed to this report.