A San Bernardino man was under arrest on Friday after he allegedly stabbed his sister-in-law to death and wounded his wife and son, police said. Officers found a man in the backyard carrying a machete and covered in blood, police said. He was identified as 46-year-old Jorge Alberto Palomo. He was taken into custody without incident. The suspect’s sister-in-law, 61-year-old Ana Maria Ramirez, was found stabbed in the driveway, police said.