Timeline of Mass Shooting Reveals First Victim Killed Two Days Prior

One of five victims of the July Fourth mass shooting in Philadelphia was actually killed nearly two days before the other fatalities.
The gunman, Kimbrady Carriker, allegedly shot through the door of Joseph Wamah Jr.'s home on July 2, killing him.
A mistaken 911 dispatch sent police to the wrong address, allowing the initial killing to go unnoticed until the mass shooting.
Carriker returned July 4, killing four others and injuring multiple people in a shooting spree along a Philadelphia street.
Authorities are now investigating the botched 911 response and why the first shooting went unreported for 44 hours.