Diego Maradona’s personal doctor was on Sunday being investigated for involuntary manslaughter four days after the Argentina legend suffered a fatal heart attack, prosecutors in San Isidro near Buenos Aires reported.

The search order was requested by prosecutors and signed by a local judge, according to a statement issued by the prosecutor’s office.

“Yesterday (Saturday) the investigation and substantiation of evidence continued with the taking of statements from people including direct relatives of the deceased,” it said.

“By virtue of the evidence that was collected, it was considered necessary to request searches at the home and office of doctor Leopoldo Luque,” the prosecutor’s office said in the statement.

The probe was triggered by concerns raised by three of Maradona’s daughters Dalma, Gianinna and Jana over the treatment he received for his heart condition at his home in Tigre. “They took the clinical files,” Luque told local television. “There was no medical error,” he added.

Maradona’s lawyer, Matias Moria, on Thursday said he would ask for a full investigation of the circumstances of the legend’s death.

“The ambulance took more than half an hour to arrive, which was a criminal idiocy,” Matias said in a Twitter post.