A list of mass killings in the United States this year

The latest mass killing in the U.S. happened Wednesday in Winder , Georgia , where four people were fatally shot at Apalachee High School .

It was the country’s 29th mass killing this year , according to a database maintained by The Associated Press and USA Today in partnership with Northeastern University .

At least 127 people have died this year in those killings, which are defined as incidents in which four or more people die within a 24-hour period, not including the killer.

A 10-year-old boy awoke to find his parents and three brothers dead in their home near Oklahoma City , all fatally shot by his father, police said.

Four people, ages 3 months to 90 years , were found inside the remains of a burning home in West Virginia .

Police said the five deaths mark the state's worst mass killing since 1999 .

A 63-year-old man in suburban Chicago killed his wife and three adult daughters in a domestic-related shooting.

A 46-year old man in Texas fatally shot his estranged wife and four other relatives, including his niece, before killing himself, authorities said.

In California , a boy, 17 , was charged with killing four members of a neighboring family in central California .