Mark ‘Papa’ Guardado, the president of the San Francisco branch of the Hell’s Angels, was shot and killed Tuesday in San Fransisco according to CBS5.

Police think Guardado may have been in fight with a rival in another motorcycle group before he was killed. Witnesses told investigators that he and the gunman struggled before the shooting and that the suspect fled on a motorcycle.

At the time of his death, Guardado was the subject of an ongoing investigation into an assault with a deadly weapon incident, said Sgt. Jim Stephenson of the Petaluma Police Department.

“He beat up a random guy at a bar,” said Stephenson. “He beat him with his hands and feet.

Police believe the rival gang, the Mongols, might be responsible for the killing and fear the Angel’s will retatliate.  They are beefing up patrols of the area to try to prevent such a thing.

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