An autopsy has found that a Chicago man was mauled to death earlier this week by his pet pit bull.

Chicago police said the autopsy shows that 44-year-old Charles Hagerman was attacked and killed by at least one of his two pit bulls. Hagerman’s wife, Charlotte Williams, found him unresponsive with one of the pit bulls on top of him in their apartment around 8:15 p.m. Wednesday.

Williams ran outside and called police on her cell phone. When police arrived, Hagerman was pronounced dead at the scene.

Stay informed with the latest headlines; sign up for our newsletter

Hagerman reportedly suffered multiple injuries from the dog attack, including a fatal neck injury, according to the autopsy. The death was ruled accidental, officials from the Cook County medical examiner’s office said.

The family’s landlord, Muhammad Alameen, told the Chicago Sun-Times he arrived home at about 8:50 p.m. Wednesday to find police everywhere.

“They wouldn’t let me in my building,” said Alameen, adding that the dog owner's family moved in across from him a few months ago.

“His wife was just sitting there in shock, just staring off into space,” Alameen said. “She said, ‘The dog killed my husband.’”

The Chicago Animal Care and Control office removed both dogs from the home.

Watch the most-viewed videos on NBCNews.com

The family had owned the three-and-a-half-year-old pit bull, Scrappy, since he was a puppy, Charlotte Williams’s son, Daryl Williams, told the Chicago Sun-Times. They took in a second pit bull, Scrappy’s son, Rocco, a year and a half ago.

Daryl said the dogs were familiar and friendly with all three members of the household, which is what made the attack so puzzling. He said the incident has traumatized his mother, leaving her inconsolable and unable to sleep.

“Nobody knows,” Daryl said of how and why the pit bull attacked. “The dogs slept at the foot of their bed. He played with my nieces and nephews. We can’t figure this out.”

More content from NBCNews.com:

Follow US News from NBCNews.com on Twitter and Facebook