Footage released Monday from a 911 call during the Lane Bryant massacre in suburban Chicago reveals the gunman saying "I'm losing it," before shooting to death five women and injuring a sixth during a botched robbery, MyFoxChicago.com reported.

Police released 37 seconds of the call in hopes that someone would recognize the voice.

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Tinley Park Police Commander Rick Bruno said the call was edited to isolate the killer's voice, and in the recording the shooter can be heard saying: "You're lucky. I'm losing it," MyFoxChicago.com reported.

His voice is heard again, but most of what he says is muffled and difficult to decipher.

Authorities released 15 seconds of the 911 call earlier this month.

Store manager Rhoda McFarland, 42, called from her cell phone moments before being killed. She whispered the name of the store, its location and told the dispatcher to hurry.

"Lane Bryant," McFarland whispers to the dispatcher.

"Where at?" the female dispatcher asks.

"Tinley Park," McFarland replies. "Hurry."

"Stay on the line. Stay on the line," the dispatcher instructs. "Don't hang up."

Then the phone goes dead.

Killed in the Feb. 2 shootings were: McFarland, of Joliet; Carrie H. Chiuso, 33, of Frankfort; Connie R. Woolfolk, 37, of Flossmoor; Sarah T. Szafranski, 22, of Oak Forest; and Jennifer L. Bishop, 34, of South Bend, Ind.

The only survivor, who pretended to be dead after a bullet grazed her neck, released a statement early in February calling the shootings "an unspeakable tragedy."

The survivor was under protective custody and her identity was not being released.

Authorities have searched waterways, interstate highways and placed electronic billboards in the Chicago area with a composite sketch of the gunman.

Police described the killer as a black man, 5 feet 9 inches to 6 feet tall, weighing 200 to 230 pounds and with puffy corn rows in his hair.

Click here to view a video report on this story from MyFoxChicago.com.

The Associated Press contributed to this report.