KANSAS CITY, Mo. — A man who told investigators he was high on methamphetamine when he killed two sisters at a Missouri home was charged Monday with two counts of first-degree murder.

Clifford B. Miller, 31, of Trimble, was charged in the slayings of Britny Haarup, 19, and her sister, Ashley Key, 22, whose bodies were found Sunday in a field.

Miller told investigators he had smoked meth before going to Haarup’s home in Edgerton, about 30 miles north of Kansas City, early Friday morning, planning to rape her, Platte County Sheriff Richard Anderson said. Authorities declined to say how Miller knew Haarup, but Anderson said Miller stated he had never had a sexual relationship with her.

Miller is being held in lieu of $500,000 bail. Platte County prosecutor Eric Zahnd said he has not decided whether to seek the death penalty.

When Miller entered the home through an unlocked front door, he found Key asleep on the couch, Anderson said. Key awoke and confronted Miller, who hit her in the head before suffocating her, Anderson said.

Miller told authorities he then went into Haarup’s room, where he beat her and suffocated her. He then wrapped up the bodies in sheets and dragged them to Haarup’s pickup truck, the sheriff said.