Published: Apr 29, 2014 6:00 PM EDT
Updated: Apr 29, 2014 6:16 PM EDT

CLEWISTON, Fla. - WINK News has obtained a copy of the 911 call that came into the Charlotte County Sheriff's Office from the Charlotte County Correctional Institution during the early morning hours of April 11.

The call was placed around the time Matthew Walker, an inmate, was pronounced dead.

Walker's family did not know the specifics of  the call until WINK News played it for them.

"I know two staff members were down," the caller, a prison employee, tells the dispatcher.  "I don't know what's going on with the inmate."

"They called the ambulance for the correctional officers, but (Walker) is the only one who died?" said Walker's nephew, Chris Fortune.  "That's crazy.  That don't (sic) even add up."

While the Florida Department of Law Enforcement investigates, Walker's family still does not know how he died.

Walker's nephews said the 911 call furthers their belief that that their uncle did not die of natural causes.

"Somebody else higher than you is looking down on you," said Vincent Fortune, another nephew of Walker's, referring to prison officials  "It's going to come to light."

FDLE says it can't comment on the case until its investigation is complete.