Alabama authorities are investigating the death of a former football player who died Monday as police were escorting him to a hospital.

Police arrested Glenn Foster Jr., a 31-year-old former NFL player for the New Orleans Saints, Friday when he was speeding at 90 mph in a 45 mph zone. Foster, who had been diagnosed with bipolar disorder at about 20 years old, was set to be moved to a hospital in Birmingham, Alabama, for evaluation, but he died during the roughly 30-minute drive between the jail and the hospital for unknown reasons, according to the New Orleans Advocate.

“This is not a situation that anyone wants to be in,” Chief Richard Black of the Reform Police Department told the outlet. “It’s really beyond words. Police do not want any problems, but some things were beyond our control.”

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The Alabama Law Enforcement Agency confirmed to the Washington Examiner its state's Bureau of Investigation is investigating Foster's death. His body was released to the Alabama Department of Forensic Sciences for further investigation.

Foster’s family members said they fear officials delayed potentially life-saving care for him, even though they knew he had been in a series of fights and appeared to be experiencing a mental health episode. His mother, Sabrina Foster, said the family wants "whoever is responsible to pay for this," the outlet reported.

Foster was booked at the Pickens County Jail on counts of reckless endangerment, resisting arrest, and attempting to elude police. His family posted a $500 cash bail Sunday for his release, but Foster allegedly got into another fight with another detainee and two guards, after which he was re-booked on three felony counts of assault and one of third-degree battery, according to the outlet.

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The New Orleans Saints, the team Foster played defensive end for from 2013-2014, offered condolences Tuesday on social media.