His testimony so far has implicated a businessman, Yorgen Fenech, the alleged mastermind who was arrested in late November and charged with complicity in the murder. Fenech awaits trial and denies the accusation.
“The first indications are that Melvin Theuma has harmed himself, but investigations are continuing,” police said in a statement.
According to the statement, Theuma was found Tuesday evening in a pool of blood at his home by officers who were on duty outside. They were alerted by a lawyer who said he could not reach Theuma by phone.
Media in Malta said Theuma’s injuries included serious injuries to the vocal cords and abdomen.
The incident occurred as Theuma was preparing to testify in the case in Valletta court on Wednesday.
Theuma claims to have acted as a middleman, paying three men accused of planting the car bomb, allegedly on Fenech’s orders.
The taxi driver and bookmaker also described how he had since lived in fear for his life and how he had gone to a seminary to confess. “My life ended at 3 pm on October 16, 2017,” he told a magistrate, referring to the time and date of the murder.
Reuters contributed to this report