Neighbors found the infant Tuesday, after hearing a sound coming from their trash can.
An Arizona man convicted in the 2009 killing of his ex-girlfriend's daughter has been given the death penalty.
Jurors in Mohave County Superior Court deliberated about four hours Monday in the penalty phase of Darrell Bryant Ketchner's trial.
The Kingman Daily Miner reports that the 54-year-old Ketchner will be formally sentenced at an April 29 hearing.
Ketchner was convicted of first-degree murder March 7.
He could have received life in prison without the possibility of parole for fatally stabbing 18-year-old Ariel Allison in July 2009 and shooting and wounding her mother, Jennifer Allison.
Jennifer Allison is the mother of three of Ketchner's children.
Prosecutor Megan McCoy says Ketchner deserved the death penalty for the brutality of his crimes.
Ketchner was arrested for domestic violence six months before the attacks.
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