DAYTON, Ohio — Investigators believe China Arnold killed her infant daughter by putting her in a microwave oven. Arnold’s attorneys argue she had nothing to do with the baby’s death in 2005.

Jury selection for Arnold was scheduled to begin Monday in Montgomery County Common Pleas Court. Arnold, 27, has pleaded not guilty to aggravated murder. If convicted, she could face the death penalty.

Police investigators believe Arnold killed 1-month-old Paris Talley by putting her in a microwave at her home. Coroner’s officials have said the baby suffered high-heat internal injuries and had no external burns. They have ruled out scalding water, open flame or other possible causes of death that could have damaged the skin.

Defense attorney Jon Paul Rion has said Arnold had nothing to do with her daughter’s death and was stunned when investigators told her that a microwave might have been involved. Arnold took the baby to the hospital after finding her unconscious and does not know how she died, Rion said.

During a pretrial hearing in July, police Detective Michael Galbraith said Arnold told him she arrived home in the early morning hours after drinking, fell asleep and was awakened at 2:30 a.m. by the baby’s crying.

She said she warmed a bottle in the microwave oven, tried to give it to the baby, changed the child’s diaper and then fell asleep on the couch with the baby on her chest.

Arnold said she and her children were the only ones in the apartment until her boyfriend arrived several hours later and noticed something was wrong with the baby.

Galbraith said Arnold told him: “If I hadn’t gotten so drunk, I guess my baby wouldn’t have died.”

When cross-examined by Rion, Galbraith acknowledged that Arnold told him she did not know how the baby suffered the burns and that she had nothing to do with it that she could recall.

Earlier this month, defense witness Robert Belloto, a staff pharmacist at Good Samaritan Hospital, testified he does not believe it would have been possible for Arnold to place the baby in the microwave because the woman was so intoxicated.

Belloto said Arnold told him she had consumed about 40 percent of a pint of high-proof rum in 90 minutes. But he acknowledged that he had no other corroboration for her claim.