Matthew Brendan Warner, 30, had also faced charges of assault on a child causing death, torture, oral copulation or sexual penetration with a child under 10 years old and aggravated sexual assault of a child.
Those charges were dismissed on Sept. 2 after he plead guilty to one count of first-degree murder and admitted a prior strike conviction, according to the Los Angeles County District Attorney's Office.
On Jan. 23, Warner allegedly sexually abused and beat his daughter, Ellorah, to death while her mother, Tawni Wallis, was working.
He then hid the baby's body in the front cab of a Nissan pickup truck, parked the truck in a parking lot in the 23600 block of Newhall Avenue and reported her missing.
Warner eventually led authorities to Ellorah's body following an overnight search.
At the time, the suspect was under post-release community supervision stemming from a 2012 conviction for unlawful driving or taking of a vehicle with priors.