A 28-year-old man was being questioned in the deaths of four family members, whose bodies were found in an upscale suburban neighborhood that boasts round-the-clock security patrols and sprawling homes.

The man, who was not identified, was picked up Friday near Portage, Wis., about 175 miles from his home in Naperville (search), Ill., authorities said.

"There was no resistance," said Columbia County, Wis., Sheriff Steven Rowe. The man was arrested on an outstanding warrant from Illinois, but details were not released.

Police in Aurora, about 30 miles west of Chicago, found the bodies Thursday in a two-story brick house surrounded by well-manicured flower beds and a trim, sloping lawn. Authorities were checking on the residents after they didn't show up for work.

No weapons were found in the home, Aurora police Lt. Rusty Sullivan said. He characterized the bodies as having suffered "severe" blunt force trauma.

The victims were identified as Jimmy Chio Tsao (search), 34, and Katherine Anne Hanson-Tsao (search), 31, who lived in the Aurora home where the bodies were found; Terrance Michael Hanson, 57, and Mary Lynn Hanson, 55, both of neighboring Naperville.

Gary Griese, a friend of Jimmy Tsao, said the Hansons are Katherine's parents.

"She was just beautiful," Griese said, adding that Jimmy was "the nicest guy in the world ... He didn't deserve this."

Also Friday, authorities were searching a house in Naperville that belonged to another relative of the Tsaos, Naperville police spokesman Joel Truemper said. That person's name was not released.

The Tsaos' home was cordoned off by police tape Friday and a small group of people gathered near the front yard, where five bouquets of white and yellow flowers lay underneath a tree between four white crosses.

One neighbor, Lynn O'Neil, 34, said Aurora residents were shocked.

"We have 24-hour security, we have a sense of safety here," O'Neil said. "The neighbors really look out for each other."

She said Jimmy Tsao often played cards with other men in the neighborhood and that he "was a really friendly, nice guy."

A longtime friend, Mike Cortino, said Tsao came to the United States as a sixth-grader and runs an import-export company, TTT Inc., that ships used computer equipment to Taiwan, where he said Tsao's parents still live.