Texas police say they've arrested the estranged wife of an internationally renowned pianist for capital murder in the deaths of the couple's two young children.

Benbrook Police Cmdr. David Babcock said Monday that police have served an arrest warrant on Sofya Tsygankova, the wife of the Ukranian pianist Vadym Kholodenko.

Police found the couple's two children, 5-year-old Nika Kholodenko and 1-year-old Michela Kholodenko, slain in their beds Thursday in Benbrook, a suburb of Fort Worth. Authorities said Tsygankova was in an "extreme state of distress."

She remains in a Fort Worth hospital on a mental health evaluation.

Vadym Kholodenko won the prestigious Van Cliburn International Piano Competition in Fort Worth in 2013.

An attorney for Tsygankova did not return messages earlier Monday.