The 29-year-old Ada Ortuya died at 12.35pm, sources at Bibao's Basurto Hospital said on Wednesday.
Ortuya, of Nigerian origin, had been at the hospital in a coma since being found by unconscious by paramedics on Sunday at a gym owned by martial artist Juan Carlos Aguilar.
Aguilar has already confessed to the murder of another woman whose remains were discovered in his gym.
The head of Basque Country's Public Prosecutor's Office Juan Calparsoro said on Wednesday that Aguilar would "clearly" face at least 30 years in prison, Spain's La Vanguardia newspaper reported.
Meanwhile, Aguilar’s status as a Shaolin master has been called into question by Spain’s Kung Fu federation, who reject the aggressor’s claims that he was a world champion stating that he wasn’t even a registered fighter.
"Technically he was good, but he wasn't a great fighter," read the statement sent out to all the official martial arts federations.
Aguilar had been a self-proclaimed Shaolin master since he first went to China 20 years ago, reported El País on Wednesday.
His willingness to publicize himself as the only real Shaolin expert in Spain with videos and interviews had caused a lot controversy within the martial arts world.
Others have said he was more of an “acrobat” than a “monk”.