"Based on that interview with the officer, they asked us to hold off on the warrant until they had the opportunity to investigate some of the information that was provided during that interview", she said.
Guyger, who was in uniform, had ended her shift Thursday night and returned to what she believed was her apartment-which turned out to actually be Jean's home.
"This family is frustrated", Merritt said during a press conference following a vigil for Jean.
The 26-year-old man who was killed by an off-duty Dallas police officer in an apartment she apparently confused for her own was a beloved member of a local church as well as an employee at a prestigious accounting and consulting firm, according to those who knew him.
Kaufman County Jail online records show that Guyger is in custody there.
Members of Jean's family questioned Guyger's explanation for the shooting.
Allison Jean, who has held government posts in St Lucia, where she lives and where her son grew up, said her son's death "just feels like a nightmare".
In a statement Saturday, the police department said the Texas Rangers took over the investigation to "eliminate the appearance of any potential bias". Hall said the officer's blood was drawn at the scene so that it could be tested for alcohol and drugs.
The shooting has raised questions about whether Guyger, who is white, used deadly force against Jean, a naturalized US citizen from the Caribbean island of St. Lucia, because he's black.More news: Joseph Randle, Former Dallas Cowboy, Arrested For Rape
Jean is black and Guyger is white.
"We're still dealing in America with black people being killed in the most arbitrary ways, driving while black, walking while black, and now we have to add living while black", co-counsel Benjamin Crump said.
The St Lucian government issued a statement expressing "shock" at the killing and said officials at its embassy in the USA would provide assistance to the family.
Funeral services for Jean are scheduled for 11 a.m. Thursday at the Dallas West Church of Christ, which Jean attended. At a press conference later Saturday, he said he believed the officer's name had been officially released.
Merritt, who represents the family of Antwon Rose II, an unarmed teenager who was shot by an East Pittsburgh police officer, said race and police's use of force are deeply intertwined in this country.More news: Turmoil at Tesla as executives leave and shares tumble
His uncle Ignatius Jean said the slaying left relatives devastated and looking for answers.
Jean's mother, Allison, suggested in an interview on Friday that her son might still be alive if he was white. Does police privilege play a role in a lack of charges in a case where there's no doubt a man is dead by her action?
"He's that kind of person", she said.
"He would always say to me, 'Brother Berry, I want to do more, '" Berry recalled.
He had recently graduated from Harding University in Arkansas and had been working in Dallas since 2016. He said he also reached out to the Saint Lucia prime minister to apologize for Jean's death.More news: Here’s What Shahid Kapoor Has Named His Son
Jean was listed on LinkedIn as a risk assurance experienced associate at PricewaterhouseCoopers.