CHICAGO HEIGHTS (CBS) — Chicago Heights police were questioning two people in the violent death of a Chicago Heights woman early Sunday that started with a disturbance at a night club and ended with a stabbing and shooting outside a sandwich shop.

LISTEN: Newsradio 780’s Steve Miller Reports

At 2:39 a.m., a 911 call came in reporting that shots were fired in the parking lot of the Big Boy Submarine restaurant, 405 W. 14th St., where the body of Marquetta Campbell, 26, was found lying on the ground and bleeding from the head.

Chicago Heights detectives believe Campbell had been dancing near a man at the club Knockouts in Matteson when that man’s girlfriend got mad and started a fight. The fight continued down the road outside the sub shop, where detectives say the jealous woman may have stabbed Campbell, right before another person took out a gun and opened fire.

Chicago Heights police investigate the scene of a 26-year-old woman's violent death early Sunday. (CBS)

Shot were Campbell and two other men. One man suffered a gunshot wound to the thigh and was taken to St. James Hospital and Health Centers in Chicago Heights while the other was shot in the forearm but refused medical attention, Chicago Heights police Sgt. Tom Rogers said.

A man and woman were being questioned in the incident as of Sunday evening.  While investigators have not determined the exact motive, Rogers said they don’t believe it was gang related.

“It seemed to be personal,’’ according to Rogers.

It was not immediately known whether the victims had been customers of the sandwich shop, which was open at the time.

Chicago Heights police have yet to recover a gun. They don’t expect any charges to come down until they know exactly how Campbell died — from a gunshot or a stab wound.  Until then, the two persons of interest will be detained. Witnesses also were being questioned.

Campbell’s mother, Joan Campbell, was inconsolable as she showed CBS 2’s Dana Kozlov pictures of the two grandchildren she’ll have to raise alone.

“It hurts me that my baby wasn’t here to teach her kids,” the elder Campbell said. “She was so smart in school. She was a CNA. She took care of anybody.”

She described her daughter as her best friend.

“I lost my best friend. I lost my sister, I lost my daughter,” Joan Campbell said. “She was the mother of my grandkids.”

Contributing: Sun-Times Media Wire.