The man who allegedly shot and killed two people in a Philadelphia convenience store robbery on Saturday was out of prison on early release following a 2012 attempted armed robbery conviction in Hinds County. 

Megan Staats, a cashier at the CEFCO convenience store on Mississippi 16 west, and Jeremy Apperson, a man in the parking lot who exchanged gunfire with the suspect, were shot dead while another man drove himself to the hospital, according to Philadelphia police.

In a Facebook post on Saturday night, Apperson's wife Samantha wrote that their girls had gone to a birthday party and that she and Jeremy and their son went for drinks and gasoline at the convenience store.

“While Jeremy was pumping gas a man walked up to my driver window and pointed a handgun at my face,” she wrote.

“Jeremy saw and pulled his concealed pistol hitting the man once. The man fired an array of bullets hitting Jeremy and the shots were fatal.”

Apperson was a transport truck driver for Philadelphia-based Prince Oil Co., Inc.

The suspect, Robert Leon Jackson, 30, of 224 Manship St., Jackson, is in custody, police said.

“He was running around the parking lot with a gun, witnesses said,” according to Philadelphia Police Chief Grant Myers.

Police received a call at about 5:30 p.m. and when officers arrived two were dead and, thanks to witnesses, officers were quickly able to locate the suspect near the motels west of the store after he fled on foot. Myers said one of the responding police officers was related to Apperson.

The suspect was transported to the hospital with a gunshot wound.

The severity of the injuries was not immediately known.

The CEFCO store is located next to the McDonalds headed west toward Pearl River Resort.

Police are asking any witnesses to come forward and assist them by calling 601-656-2131.

Philadelphia police were assisted by the Neshoba County Sheriff's Department and Choctaw Police.

Jackson was sentenced to 15 years in 2012 in Hinds County. He has been out of prison since January on “earned release supervision,” according to the Mississippi Department of Corrections website.

He’d gone into City Furniture on Bailey Avenue with the intention of robbing the business, but a store employee shot him, WLBT reported in 2010.

“Police say Jackson body entered the store displaying a weapon. But a store employee turned then tables on Jackson when he pulled out a gun and fired several shots at the would-be-robber,” the station reported.