A 59-year-old man attacked by four pit bulls at a southwest Modesto home has died from his injuries, sheriff's officials said Wednesday.

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A man who was mauled along with his 77-year-old mother by four pit bulls at a southwest Modesto home has died. Watch report: Modesto man dies after pit bull attack; Elderly mother injuredThe 54-year-old man, identified Wednesday as Juan Fernandez, died of multiple traumatic injuries from Tuesday's attack, sheriff's officials said.Juan Fernandez's mother, Maria Fernandez, remains in critical condition at Doctors Medical Center.Stanislaus County Sheriff Adam Christianson said the dogs were owned by the victims' neighbors and got into the victims' yard by digging a hole under a common fence.The owners have not yet been arrested but could face charges, Christianson said."There is still a lot of work to do," he said. "We have to be able to finish the investigation to determine what happened that led up to this tragedy."The situation began at 5:45 p.m. Tuesday when deputies received 911 calls about a dog attack in the 800 block of Glenn Avenue.When deputies arrived at the home, they found two pit bulls attacking Juan Fernandez in his backyard, Christianson said.That's when deputies shot and killed the first two dogs. The other two pit bulls ran to a nearby yard, apparently spooked by the gunfire.Investigators then secured the backyard where the attack took place and entered the house. They soon found Maria Fernandez, who also had been attacked, inside the home, Christianson said.Maria Fernandez had multiple traumatic bite wounds, officials said."The dogs were acting in a vicious manner and posed a credible threat to the community," Christianson said. "Both were vicious, aggressive and charged (at) the deputies."Officers found the other two pit bulls who had run from the house into the yard. They were also shot and killed.The bodies of the pit bulls are in the custody of the Sheriff's Department.Authorities will investigate whether the dogs were micro-chipped, had all proper vaccinations and were involved in any prior attacks.To charge the dog owners criminally, Christianson said authorities would have to show they were negligent. Investigators will be looking to see whether the animals had any contact with animal control officers prior to the attack over bites or vicious behavior.A jury found a man guilty in August of second-degree murder after his pit bulls mauled a woman to death in the high desert town of Littlerock in Southern California.Prosecutors argued that Alex Donald Jackson, 31, was not just negligent but also knew that his animals could endanger someone's life. They presented evidence that the dogs were involved in at least seven other altercations in the 18 months before the fatal attack on 63-year-old Pamela Devitt.Also in Southern California, a pit bull mix was cut with a knife and hit with a shovel in South Los Angeles by a person most likely acting in self-defense, police said this week.