Both teams were taken off the field by the referee after play was stopped following an incident in the stands at Vicarage Road.
Chelsea defender Marcos Alonso appeared to alert the referee and the medical staff on the touchline about the incident. Chelsea’s medics ran across the field to the help with the situation.
The score was 0-0 at the time.
Some Chelsea players were seen covering their faces as they looked over to where the incident was unfolding.
There is a hospital near the stadium.
On Oct. 17, a match between Newcastle and Tottenham was halted for 20 minutes when a spectator suffered cardiac arrest. A doctor who was in the crowd performed chest compressions before paramedics arrived.