Former NFL and Illinois football player Glenn Foster Jr. has died in custody following a high-speed chase that led to his arrest, according to a report from ESPN. He was 31.

According to the report, Foster was involved in a fight with law enforcement following his arrest. He was involved in a high-speed chase in which he reached speeds of 90 mph. While being handcuffed, Foster then reportedly got into an altercation with officers.

One officer sustained injuries to his nose and hand, per the report. From ESPN:

Foster had an initial court appearance before Pickens County District Judge Samuel Junkin, where he was “non-compliant and refused to respond to answer any questions” aside from demanding an attorney, the judge wrote.

Based on police observations and how Foster behaved, the judge said Foster was “not mentally stable and a danger to himself and others” and ordered him held without bond for a mental evaluation.

But what happened from that time until his death was a mystery. Few other details have been released.

Foster spent 3 seasons at Illinois, playing for the Fighting Illini from 2010-12. He totaled 73 tackles, 11 for loss and 4 sacks during his time in Champaign.

Following the 2013 NFL Draft, Foster was signed by the New Orleans Saints as an undrafted free agent and spent 2 years with the franchise.