Police arrived at the MI home on New Year's Day to find the 4-year-old girl unresponsive.
Diaz told cops Fields punched her and smashed her phone before turning the gun on himself and blowing a whole in his leg, shouting "see if you can outrun these bullets", according to the report.
Police responded to a 911 call around 10:45 a.m. on January 1 for an unresponsive 4-year-old girl.
According to the police, the deceased, Gabby Barrett, had severe burns and succumbed to her injuries.
A medical examiner ruled the child's death a homicide with evidence of multiple traumatic injuries and battered-child syndrome, meaning she suffered multiple injuries, at multiple sites, at multiple ages.
According to the police, the duo is believed to be driving in a black 2002 Chevrolet Cavalier with the MI license plate DTR 1854.
Police launched a manhunt for Diaz and Fields, who have been charged with felony murder, second-degree murder, first-degree child abuse and torture, police said. The police have urged the people to call the U.S. Marshal Detroit Fugitive Apprehension team at 313-234-5656 or the Sumpter Township Police at 734-461-4833 ext.
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Gabby was rushed to a nearby hospital where she later died.
Stay with FOX 2 for more information on this developing story. Fields fled the scene, but was later picked up on domestic violence charges.
[Photo: US Marshals]Gabby's biological father, Kyle Barrett, isn't a suspect in the child's murder, according to FOX2.
Diaz pleaded guilty to two charges: possession of prescription forms and altering ID marks on a firearm, online court records show.
The investigation began after police responded to the home in Sumpter Township and the child wasn't breathing.
Barrett's grandmother, Deborah Barret said: "She was a ball of joy". "She would run around the house when we had her, always with a big ol' smile on her face".
Mugshots released Monday by Sumpter Township police officials appear to stem from charges filed against both Fields and Diaz following that incident.