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Autopsy results released Thursday by the Santa Barbara County Sheriff's Office show that the three people who were killed Dec. 28 in Orcutt died from blunt force and sharp force trauma after being beaten and stabbed multiple times. 

The three victims, who lived in a house on the 5900 block of Oakhill Road in Orcutt, were identified as 34-year-old Nicole McNabb, 64-year-old Melanie McNabb and 63-year-old Carlos Echavarria. 

According to the Sheriff's Office, the weapons recovered at the crime scene included a sledgehammer and several large kitchen knives. 

The motive for the killings remains under investigation. 

The bodies were discovered Dec. 28, just after 8 p.m., when sheriff's deputies were dispatched to the gated community of Oakhill Estates in south Orcutt in response to a female resident who entered the home and found a bloody crime scene. 

The homicide suspect, identified as David Gerald McNabb, 43, was inside, armed with an unloaded rifle and barricaded himself inside the home.

A confrontation ensued between McNabb and deputies, who reportedly shot McNabb with less lethal ammunition followed by the use of deadly force, when attempts to subdue him were unsuccessful. McNabb was taken to a hospital where he later died.

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Gina Kim covers crime and courts for Santa Maria Times. Follow her on Twitter @gina_k210