A man from Santa Rosa is behind bars on suspicion of decapitating a relative. Twenty-four-year-old Luis Gustavo Aroyo-Lopez was arrested at a transit center in San Francisco on Saturday morning. Police say the head of the victim, a woman in her 60s, was in the suspect’s possession as he fled the scene of the alleged murder in Santa Rosa. But, it has not been found by police. Lopez was just released from state prison this past Wednesday. He had been serving time on assault with a deadly weapon and weapons possession charges not connected with the woman he is now accused of killing.