"We are horrified. We did not see this coming and our thoughts and prayers are with the victim and the victim's family," a woman, who identified herself as related to Gladden's father, said in a statement on the family's behalf to the Associated Press Monday.
During the investigation, officials searched the home of Gladden's mother and stepfather, Andrew Piper. During that investigation, Piper, 43, was arrested and charged with illegal possession of firearms and possession of marijuana.
Students returned to school today with heightened security. Perry Hall High School students have started a Facebook page titled "Thanks Mr. Wasmer" to honor the school resource officer who restrained Gladden from shooting more students.
"Thank you sooo much Mr. Wasmer we all think you are a hero today!" the page says.
"Very brave!!!! Thank you is certainly not enough. My son was at school today and I am fortunate enough to have him with me now. Because of you, many more can say the same thing," one comment said.