A Billings man accused of killing two sisters has pleaded not guilty to charges of deliberate homicide.

Andrew Denning appeared Monday by video before District Judge Gregory Todd.

Prosecutors say the 20-year-old Denning told his girlfriend that he killed 22-year-old Rose Edwards and her 21-year-old sister Daisy on Jan. 27 when they wouldn't pay for prescription sleeping medication he brought them.

Officers sent to the apartment on a welfare check two days later found their bodies covered with blankets.

An autopsy concluded that Rose Edwards likely died of a stab wound to the neck and she had been strangled.

Daisy Edwards suffered a stab wound to the heart and other stab wounds in clusters all over her body.

Denning is being held on $1 million bail.