The Latest on the killings of a couple and their 5-year-old daughter (all times local):

3:45 p.m.

A 27-year-old man from the San Diego area has been arrested in the killings of a doctor, his wife and their 5-year-old daughter in their Santa Barbara County home.

KEYT-TV reports that Sheriff Bill Brown announced the arrest of Pierre Haobsh of Oceanside at a news conference on Friday afternoon.

Brown says Haobsh was arrested in the San Diego area. The Los Angeles Times reports that Haobsh was a business associate of the family and was taken into custody at gunpoint.

The bodies of 57-year-old Dr. Weidong "Henry" Han; his wife, 29-year-old Huijie "Jennie" Yu, and their daughter, Emily Han, were found on Thursday morning.

The sheriff called the case diabolical and complex.

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2:40 a.m.

Authorities are searching for a suspect in the deaths of a couple and their 5-year-old daughter in a Santa Barbara County home.

The bodies were found by detectives Thursday morning when they entered the home on Greenhill Way.

County sheriff's deputies sought a search warrant after they were asked to check on the family's welfare Wednesday evening and decided to open a suspicious death investigation.

The victims were 57-year-old Dr. Weidong "Henry" Han; his wife, 29-year-old Huijie "Jennie" Yu, and their daughter, Emily Han.

Sheriff's spokeswoman Kelly Hoover says the three were slain by an unknown killer. She won't discuss how they were slain or a possible motive.

Hahn owns the Santa Barbara Herb Clinic. The website says he practiced traditional Chinese medicine, including herbal treatments and acupuncture.