On Sept. 27, a jury at the Joshua Tree Superior Courthouse came back with guilty verdicts on 2nd degree murder and assault on a child causing death for Joshua Kruzik, 23.
Kruzik, who is facing 25 years to life, is scheduled to be sentenced on Nov. 30.
In 2012 Kruzik was staying with the baby's parents, Timothy and Melissa Allen, who were both Marines stationed in Twentynine Palms, authorities said. Kruzik was in Twentynine Palms for training.
On Nov. 20, 2010, sheriff's deputies responded to the 6200 block of Daisy Avenue in Twentynine Palms after Timothy Allen came home and found his baby in her crib not breathing, authorities said.
The San Bernardino County sheriff-coroner later determined the baby died because of blunt force trauma, authorities said.
Kruzik was discharged from Marine duty and transferred to a civilian jail to face charges, authorities said.