Pieced together through 911 dispatches and other sources, here's how everyday heroes responded to a hostage situation and killing of a police officer.

A funeral service will be held later this week for the Pennsylvania police officer fatally shot while responding to a hospital intensive care unit where a gunman had shot three workers and taken

Suse Lowenstein’s son was killed in the 1988 bombing of Pan Am Flight 103 over Lockerbie, Scotland. An artist, she responded by creating a huge sculptural installation, Dark Elegy, depicting the raw emotion women felt the day they learned their loved ones died.

Officials are investigating a possible motive that led to a man entering the UPMC Memorial Hospital ICU where several staff members were shot and taken hostage on Saturday. ABC News reports that Diogenes Archangel-Ortiz,

Three UPMC Memorial Hospital workers and three police officers were shot — one of them fatally — in what York County District Attorney Tim Barker described as an attempted hostage situation Saturday morning.