Nancy Pfister and her daughter Juliana
Courtesy Juliana Pfister
03/16/2014 at 01:00 PM EDT
Authorities said Saturday that a third suspect was arrested in the killing of an Aspen, Colo., socialite, more than a week after a couple who rented the woman's home were taken into custody.
Katherine M. Carpenter, 56, was apprehended Friday night in the death of Nancy Pfister
, the Pitkin County Sheriff's Office said. Carpenter was being held without bond on suspicion of first-degree murder and conspiracy to commit first-degree murder.
Pfister, 57, was the daughter of the late Betty and Art Pfister, prominent Aspen residents who co-founded the Buttermilk ski area west of town that's hosted the Winter X Games multiple times.
Her body was found in an upstairs closet at her home
on Feb. 26, but investigators have not said when or how she was killed.
On March 3, authorities arrested William F. Styler III, 65, and Nancy Christine Styler, 62, at a lodge in Basalt. They were staying at the lodge after apparently moving out of Pfister's home Feb. 22, the same day Pfister returned from a vacation in Australia.
The Stylers, who rented Pfister's home during the fall, are expected to be formally charged Monday with first-degree murder and conspiracy to commit first-degree murder.