MANILA, Philippines--An inmate at the Manila City Jail committed suicide on Tuesday afternoon inside the facility, shooting himself in the mouth using a jail guard?s gun, the police said Monday.

Aldrin Bautista, 30, who had been detained for three years on drug charges, killed himself inside the quarters of Jail Officer 1 John Ancheta using the latter?s cal. .38 revolver, according to Chief Insp. Erwin Margarejo Jr., head of the Manila Police District homicide section.

However, despite initial findings which pointed to a suicide, Ancheta would still be subjected to a paraffin test to determine whether or not he had fired a gun, Margarejo said.

He added that Ancheta had told the police he would submit himself to an investigation to clear his name although he could still be charged administratively in connection with the inmate?s death.

Margarejo said the shooting incident took place at 3:18 p.m. on Monday. A few minutes before, Bautista was eating with fellow inmate Chuck Cortez when the former stood up and said he was going to Ancheta?s quarters. He even told Cortez to warn him if he saw the jail guard coming.

Bautista frequently ran errands for MCJ guards who allowed him access to their quarters.

Minutes later, Cortez said he heard a gunshot coming from Ancheta?s quarters. He tried to open the door but failed because it had been locked from inside.

At this point, Ancheta arrived and asked Cortez who was inside his room. He picked the lock and managed to open the door. Inside, he found Bautista lying on his bed with a gun clutched to his chest.

Margarejo told the Inquirer that three days before he killed himself, Bautista had complained to several inmates about his situation.

?He wanted to get out of jail and to be reunited with his family. He was even overheard saying goodbye to his father over the phone,? Margarejo said.

Although he ruled out the possibility of foul play in Bautista?s death, the police official said Ancheta could be held administratively liable for negligence because he left his firearm in his room.

?He did not bring his firearm with him because of the [Commission on Elections] gun ban but he left the revolver on his bed. He claimed he closed [his room] and did not think that anyone would tinker with the gun,? Margarejo said.