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Police have identified the Normandy High School freshman who died after being punched in the chest yesterday.

Wellston Police say 15-year-old Marquez Oliver and a friend were goofing around during lunch--they were taking turns punching one another in the chest. Oliver collapsed and was rushed to the hospital where he died.

Authorities are still investigating to see if Oliver had a preexisting medical condition that contributed to his death.

A day after a Normandy High School student died following an incident at the school, police are still trying to piece together what happened. 

KMOV TV reports police say the 15-year-old student collapsed after another student, 14, reportedly struck him in the chest. 

Officers say the interaction was believed to be friendly, and the students were simply horsing around. After the student collapsed, he was taken to St. Louis Children’s Hospital where he was later pronounced dead.

The incident was believed to have happened shortly before 1 p.m. Thursday. It is unknown if the student suffered from a preexisting medical condition that may have led to the collapse. Police are currently collecting statements from other student witnesses.

An alert parent is being credited with stopping a potentially dangerous situation before it could escalate.

Wellston police Sergeant Marvin Berry says the mother of a Normandy High School student saw people exchanging guns inside a car on the school parking lot Tuesday afternoon. She alerted school security. They called police.

Police searched two SUV's and found two handguns. Four people, three of them students, have been arrested.

A letter sent to parents by the school principal, Calvin Nicholas says no one was directly threatened in the incident.