A North Carolina businessman who coached basketball at the religious school where his teenagers attended classes fatally shot his family in their upscale home before turning the gun on himself, police said Tuesday.

Authorities would not hint at what might have driven William Maxwell to kill his wife and two children Monday night. Bewildered friends described the Maxwells as active churchgoers and good neighbors, with a student-athlete son who helped his father maintain a meticulous lawn around their home in Fayetteville and a daughter who was a cheerleader applying to colleges.

"Billy, if you knew him, loved his family. Everybody knew that. That's what makes this so tragic," said John Cook, pastor of Snyder Memorial Baptist Church, where every member of the family was active. "Obviously something tragic was going on for this to happen."

Police said Maxwell, 47, shot and killed his wife, Kathryn, 43, and their children, 17-year-old Connor and 15-year-old Cameron, before killing himself. Connor Maxwell was found in an upstairs bedroom, the other three bodies were in the kitchen.

William Maxwell was a builder and land developer who built residential subdivisions in Cumberland and Harnett counties, said John McKinney of Fayetteville, who described himself as Maxwell's business partner and friend for more than a decade.

Richard Wiggins, an attorney for Maxwell's business operations, said Maxwell had been "concerned about a lot of things lately," including some legal matters related to a single-family subdivision he was working on. But Wiggins said those issues were close to resolution.

"I was absolutely shocked and just could not believe anything like this could happen," Wiggins said.

Maxwell followed his father into the residential real estate business and also owned a couple of local car washes, while his wife Kathryn was a stay-at-home mother who taught Sunday school at Snyder Memorial.