G.R. No. 11634 - People vs. Mambang

On August 7, 1957, around 11:00 a.m., Fernando Gonzales, a bodeguero at the Pujalte Warehouse in Manila, heard moaning coming from within the area.
Upon investigating outside the warehouse, he witnessed appellant Antonio Fausto y Tomas stabbing Dr. Antonio Casal, who was lying with his face upward on the ground.
Detective Benito Carasco, while attending to another case nearby at St. Joseph Hospital, responded to a call by a nun and found the appellant armed with a knife, shouting “Napatay ko siya” (“I killed him”).
Detective Carasco ordered the appellant to drop the knife; once he did, the detective arrested him, secured the weapon, and subsequently gathered evidence including the immediate re-enactment of the crime at the scene.

The victim, Dr. Casal, was found sprawled on the ground, covered with blood.
An autopsy by Dr. Mariano B. de Lara, Chief MPD Medical Examiner, revealed that Dr. Casal sustained 18 stab wounds, with the fatal wounds identified among those described in the autopsy report.
The cause of death was determined to be “profuse exsanguinating hemorrhage” and “shock due to multiple slashing stab wounds,” as corroborated by the autopsy report, sketches, and photographs.

Prior to the crime, appellant was confined at the National Mental Hospital from June 27 to July 9, 1956, where he was observed and diagnosed by psychiatrists as suffering from schizophrenia of the paranoid type, although his treatment was discontinued upon his discharge against medical advice.
Subsequent to his release, appellant’s mental condition was again examined when he was confined by court order on October 28, 1958, until March 9, 1959.
Testimony by Dr. Leonida Mariano during the initial confinement attested to the appellant’s coherent and relevant responses, his neat appearance, and consistent personal data, indicating soundness of mind.
Dr. Carlos Vicente, during the second confinement, observed that while the appellant experienced a form of mental illness affecting his personality, his intellectual faculties and the functioning of his brain were unimpaired.
Additional testimony from Fr. George Haggenburg noted unconventional behavior, including a letter promising money for prayers, but these were deemed insufficient to conclusively prove a state of insanity.

The appellant, employed previously at the San Miguel Brewery with a daily wage of P6.50 and sole support for his wife and seven children, claimed to have suffered significant personal and economic setbacks.
He attributed his confinement at the mental hospital to the influence of Dr. Casal and, after failed efforts to secure the necessary certification for re-employment, formed a premeditated plan to confront and subsequently murder the victim.
His detailed statement and re-enactment of the commission of the crime, including the planning and execution phases, underscored the premeditated nature of the act.

Whether the evidence presented established that appellant was insane at the time of the commission of the crime.
Whether the defendant’s prior confinement and psychiatric evaluations sufficiently protected him from criminal liability under the doctrine of insanity.

Whether the brief period of the initial confinement (13 days) allowed for an accurate and reliable diagnosis of mental illness.
Whether the later psychiatric findings, more than a year after the crime, could be used to infer the appellant’s mental condition at the time of the offense.