The man who engaged Phoenix police in a barricaded standoff for much of Christmas night is in jail without bond on murder charges in his children's and ex-wife's death.

Anthony Milan Ross, 45, admitted he went through his ex-wife's pants pockets to move her car so he could leave his home near 16th Street and Highland Avenue after she was shot. Witnesses told police it was Ross who shot the woman.

Police arrived around 3:45 p.m. Monday and witnesses said they believed Ross was inside his apartment with his two children.

EARLIER: 2 kids, mom dead after Christmas Day standoff with kids' dad in Phoenix

Officers attempted to negotiate with Ross for hours before going inside, confronting Ross and finding his children dead. Ross fired at the officers, according to police documents, injuring one officer before being arrested.

Police have identified the victims as Iris Ross, 38, Nigel Ross, 11, and Anora Ross, 10 months.

"We got the text at 2:50 p.m. from Milan where he stated that he had shot and killed Iris and the kids," said Iris Ross' friend and roommate Lushanya Echeverria.

Echeverria tells 12 News Iris and Milan had finalized their divorce earlier this year. She says Milan was extremely dependent on Iris.

"He had a very intense side of him," Echeverria said.

Echeverria says Milan purchased a gun a few weeks back and notified Iris. Echeverria was concerned.

"I had seen his behavior escalating for the past two weeks," she said.

He faces three first-degree murder charges, as well as two counts of aggravated assault for pointing a gun at witnesses to his ex-wife's shooting and 19 counts of aggravated assault on an officer.

Family members of Iris and her children have set up a GoFundMe page to raise money for funeral costs.