G.R. No. L-42965 December 3, 1987
PEOPLE OF THE PHILIPPINES, plaintiff-appellee, vs. MANUEL GUARDO, CARLOS TAMAYO and ORLANDO TAMAYO, defendants-appellants.

FACTS

The case stemmed from the killing of Ruben Estanislao on April 11, 1974, following a dispute over a stolen kitchen stove. Estanislao had implicated Orlando Tamayo in the theft, causing resentment from Orlando’s father, Carlos Tamayo. On the morning of the incident, prosecution witnesses Norma Madayag and David Estanislao testified they saw Manuel Guardo stab Ruben Estanislao in the chest with a kitchen knife while the victim’s arms were being held by Carlos and Orlando Tamayo, preventing any defense. The victim’s widow, Sebastiana, corroborated the scene and her husband’s dying declaration identifying his assailants.
Manuel Guardo admitted to the stabbing but claimed the defense of insanity, alleging he heard voices and felt pursued the night before. He also asserted he acted alone, provoked by Estanislao’s insults, and exculpated the Tamayos. Orlando Tamayo denied participation, claiming he was elsewhere during the incident. The trial court convicted all three of murder.

ISSUE

The primary issues were: (1) the validity of Guardo’s insanity defense; (2) the criminal liability of Orlando Tamayo; and (3) the proper classification and penalty for the crime.

RULING

The Supreme Court affirmed the convictions but modified the civil indemnity. The insanity defense was rejected. Guardo failed to prove he was insane at the exact time of the crime; prior confinement and claimed auditory hallucinations did not establish loss of reason or self-control during the stabbing. His immediate surrender and coherent actions negated the plea.
The Court upheld Orlando Tamayo’s conviction based on the positive, consistent, and credible eyewitness accounts that he and his father restrained the victim, enabling Guardo to stab him without risk. This concerted action established direct participation, making him equally liable as a principal. The claim of alibi was inferior to the positive identification.
The killing was correctly classified as murder, qualified by treachery (alevosia). The means employed—restraining the victim—ensured the execution without any defense from him. While abuse of superiority was present, it was absorbed by treachery. Conspiracy and evident premeditation were not proven. Guardo was correctly granted the mitigating circumstance of voluntary surrender. The penalty was affirmed, but civil indemnity was increased to P30,000.00. Carlos Tamayo’s death extinguished his criminal liability.