PACIFICA (CBS SF) – The investigation into an August dog mauling in Pacifica that killed a pregnant woman was completed Thursday and police said it cannot be determined why the woman’s family pet went off.

Darla Napora, 32, was attacked on Aug. 11 by her family pet “Gunner,” a 75-pound pit bull terrier, at her home at 588 Reina Del Mar Ave.

READ MORE: Attorney General's Office: Man Shot Dead by Police at SFO Armed With Replica Gun

Napora’s husband found her when he returned home to find the 2-year-old male pit bull hovering over her mauled body.

Police said Napora died as a result of the attack and no other factors led to her death.

Capt. Dave Bertini said a necropsy on the dog did not turn up any disease or condition that would explain the attack. The dog was also apparently treated like a member of the family and had no history of violence.

The dog was shot when it tried to escape when emergency responders arrived at the home.

READ MORE: San Francisco 49ers Confirm DE Bosa Cleared to Play Against Packers

No foul play was indicated in the investigation, police said.

The San Mateo County coroner’s office, Peninsula Humane Society and two forensic odontologists, or bite experts, assisted police in the investigation.

 

(Copyright 2011 by CBS San Francisco. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)

MORE NEWS: Sharks' Minor Leaguer Suspended 30 Games For Racist Gesture