Police on Wednesday announced the arrest of a suspect in the July slaying of a real estate agent who was found stabbed to death in a model home.

Kosoul Chanthakoummane, 25, was arrested on a charge of capital murder late Tuesday in connection with the death of Sarah Anne Walker, said Capt. Randy Roland of the McKinney Police Department.

Chanthakoummane was arrested at his Dallas apartment and was being held Wednesday morning on $1 million bond, Roland said.

A house-hunting couple found Walker's body July 8 in the kitchen of a model home in the fast-growing suburb of McKinney, about 30 miles north of Dallas. The 40-year-old agent had been stabbed 27 times in what detective described as an unusually ferocious attack.

The slaying rattled real estate agents who work open houses alone and worried nearby residents living in the kind of new, extravagant homes Walker sold.

Roland said a combination of detective work, witness statements and forensic evidence led investigators to Chanthakoummane.

The McKinney police released a composite sketch a couple of weeks ago based on witness statements, Roland said. The sketch prompted a tip that led police to Chanthakoummane, he said.

Roland said Chanthakoummane is the only suspect in the case.

Further details of the case, including a motive for the slaying or any possible relationship between Chanthakoummane and Walker, were not available early Wednesday. Roland said a press conference was scheduled for Wednesday afternoon to discuss the arrest.

Detectives began interviewing Chanthakoummane after he was arrested, but the interview was stopped when he requested a lawyer, Roland said.

Walker, a twice-divorced mother of two children, was a top-seller for home builder D.R. Horton. She earned free vacations for the high volume of brick-and-slab homes she closed.

Early in the investigation, police said Walker's slaying did not appear to be random and that the her wide network of acquaintances made the investigation more challenging.

The case was featured on the television show "America's Most Wanted" in July.