Argentine defender Cristian Gomez has died after collapsing during a game for his club Atletico Parana on Sunday.
The 27-year-old fell unconscious half-an-hour into the match against Boca Unidos in Argentina's second-tier Primera B.
"We tried to revive him and he died on the way to hospital," said Miguel Darre, doctor of home side Boca Unidos.
Matches in Argentina had only just resumed this weekend after the death of Emanuel Ortega on 14 May.
San Martin de Burzaco defender Ortega, 21, died in hospital after failing to come out of a coma following injuries when he hit his head on a concrete wall surrounding the pitch.
When Gomez collapsed, team-mates and opponents immediately took off their shirts to fan him and cried for help.
"The doctors told us they couldn't resuscitate him. This is totally unexpected, unbelievable. He'd never had anything wrong with him," said match supervisor Ramon Gomez.