South African Olympic and Paralympic track star Oscar Pistorius was ordered by the court on Tuesday to undergo a month of psychiatric tests to find out whether he was criminally responsible on the night he shot dead his girlfriend on Feb. 14 last year, an SABCNews video showed.

Judge Thokozile Masipa told Pistorius he had to report to Pretoria’s Weskoppies hospital, one of South Africa’s top mental institutions, as an outpatient for up to 30 days, starting on May 26.

“The panel [of mental health professionals] will establish whether the accused was by mental illness or defect criminally responsible for his actions. The panel will also seek to establish whether Pistorius appreciated the wrongfulness of his conduct,” Judge Masipa said.

The court’s decision is likely to prolong the proceedings. which were initially estimated to last at least three weeks.