A rose is left on the casket during the burial of Reverend Clementa Pinckney at the St James AME Church Cemetery in Marion, South Carolina June 26, 2015. REUTERS/Randall Hill

Boston resident Alex DoSouto, 24, was starting to turn his life around when it happened Jan. 8. In Oregon, Kimberly Saltmarsh Dietz, 59, was back in school working toward a degree in science when it happened Oct. 1 . Ke’Arre Stewart, 29, had served his country in Iraq and come back home to his family in Colorado when it happened Nov. 27.

DoSouto, Dietz and Stewart were among hundreds of people killed by gun violence across the U.S. in 2015. From hate-motivated mass shootings that received 24-hour news coverage to localized violence in homes to gang activities in Chicago and Oakland, California, 2015 brought a continuation of previous violent years. Communities across the U.S. are trying to recover and make sense of what has happened, hoping that 2016 won’t be another year scarred by frequent shootings.

“It’s a combination of available weapons and really pathological people who commit horrific crimes, and we have to address both of those things,” said Ronald Sullivan, a Harvard law professor who has studied gun violence for two decades.

Below are the names of victims killed in mass shootings across the U.S. from Jan. 1-Dec. 28, 2015. Cases are defined as mass shootings when they involve four or more victims. Hover your cursor over the names of victims to learn more about them and read local media reports. Information can be sorted by name, location and keyword.

Data were used from crowdsourced platforms the Mass Shooting Tracker and the Gun Violence Archive, which link to local media reports. Victims' names were gathered using media reports and information provided by local police departments and medical examiners' offices. If you are aware of any additional cases that fit the criteria of four or more people involved in a shooting, please contact us.

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