As details of the Binghamton shooting investigation emerge, we're beginning to get a clearer picture of how long Jiverly Wong had planned to carry out his attack. Tammy Palmer takes us through the police timeline and the terrifying moments leading up to and following the shootings.

BINGHAMTON, N.Y. -- Wednesday, March 18th, 2009. Jiverly Wong dates a letter, addressed to News 10 Now describing a vision to take "at least two people with me to return to the dust of the earth."

Friday, April 3rd. The letter to News 10 Now's Syracuse station is mailed.

Wong drives to the American Civic Association and parks the car he's in tight against the back door, blocking the exit. Dressed in body armor, with extra ammunition wrapped around his neck, Wong grabs two handguns and walks through the front door.

Inside, receptionist Shirley Delucia asks Wong if he needs help. He reaches for a gun and shoots her just millimeters from the main blood vessels in her upper right abdomen. She falls back to the floor and pretends to be dead.

Wong moves on to a classroom, opening fire.

10:30 a.m., Broome County 911 dispatchers receive the first call.

Dispatcher: “Be Advised. Shots are coming from the second floor. Assailant still in the building at this time. Police: Stand by until you get a backup there. Nobody go into that building alone.”

Hearing the shots, more than two dozen people run to hide in the boiler room of the American Civic Association. With English as a second language, the fearful caller struggles to communicate his location.

10:32 a.m., another call comes in.

Dispatchers have now pinpointed the location of the call. They advise those hiding to barricade themselves in.

Police: “If you can communicate with anybody from any of them, have them lock their doors.”

Dispatcher: “There's no locks on the doors. I'm trying to get them to use something to barricade.”

One minute later, 10:33 a.m. The first police on the scene arrive outside the building. From this point forward, no shots are fired.

Inside, receptionist Shirley DeLucia is losing blood rapidly. She manages to crawl under a desk.

At 10:38 a.m., DeLucia picks up a phone and calls 911 with a description of the gunman.

Dispatcher: “Suspect is described as an oriental male, wearing a green jacket, black glasses, in his 20s.”

11:13 a.m. SWAT teams enter the building. Crews slowly convince survivors to come out of hiding and evacuate the American Civic Association.

At 11:27 a.m, 49 terrifying minutes after her call for help, Shirley DeLucia is rescued. She has lost as much as a thousand milliliters of blood.

Binghamton, N.Y., April 3rd. A letter to News 10 Now is postmarked. It arrives three days later, the morning of Monday, March 6.

The exact times of Jiverly Wong's actions are far less complicated to trace. Healing is more fluid, impossible to stamp with a date and time. For the victim's families, it is a process that takes a lifetime.