Relative: Boyfriend, mother wanted for killing 4-year-old had abusive past

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A mother and her boyfriend are on the run accused of killing the woman's young daughter.

U.S. Marshals are offering a $5,000 reward for information leading to the arrest of 24-year-old Candice Diaz and 28-year-old Brad Fields. Diaz's 4-year-old daughter Gabby was found dead in her Sumpter Township home last week. 

The girl's biological father made a plea for the couple to turn themselves in. Police want the public to look for a dark colored Chevy Cavalier with a license plate DTR 1854.

Michigan mom and boyfriend wanted for murder, torture charges in death of 4-year-old daughter

The family of one half of a fugitive couple says they have been together on and off for six years - and during that time one thing was constant violence. All of that allegedly led to the death of little Gabby on New Year's Day. 

The cousin of Brad Fields says the relationship between him and his girlfriend Candice Diaz has been plagued with abuse throughout the relationship. 

"Just a very violent, scary person," said Ken Stambaugh, Fields' cousin. "You could tell that he had a lot of control over her. If another man came into the room she put her head down, wasn't allowed to talk or had to leave the room."

Charges likely in death of girl, 4, found with burns in trailer park

Ken Stambaugh says from 2013 to 2016 he lived just three doors down from his cousin and Diaz in a mobile home park in Sumpter Township. 

"We did the best we could to try and help him but it was constant going down and saving the girl he was with," Stambaugh said. "If it wasn't that particular girl because they were on and off, it was some other girl. Anyone he was with; he was trying to harm."

Police visits to the couple are documented. In 2016 cops called out to the Rawsonville Woods Mobile Home Park after Fields allegedly shot the dog, shot himself and beat up Diaz. 

Vigil held for girl, 4, who died of severe burns in Sumpter Township

His cousin says there were too many problems to count. 

"Paranoid schizophrenic on a lot of pills and other drugs," Stambaugh said. "Constantly in trouble with that girl, putting his hands on her."

All of which allegedly culminated on Jan. 1 when the body of Gabby Barrett, the daughter of Diaz, was found tortured, burned and left at the couple's mobile home.

Police haven't been able to find them yet but family seems convinced they're still close.

"He's still in this area he's got nowhere else to go," his cousin said.

Stambaugh made a desperate plea to bring this searching to an end. 

"Turn yourself in, give the family some justice," he said. "Give the baby some justice. You can't run forever."

Fields' cousin told FOX 2 he should be considered extremely dangerous.  Anyone with any information on where this couple is, should call 734-461-4833.

Gabby's family has set up a GoFundMe account for funeral costs. CLICK HERE FOR MORE.