Police said Reginald Brown, 63, was identified as the suspect in the fire in the 8600-block of South Hermitage Avenue on February 28.
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RELATED: 'He was going to set her house on fire': Deadly Gresham fire intentionally set, family claims; 10-year-old girl, mother killed
Brown was taken into custody on Tuesday in the 7000-block of South East End Ave. and has been charged with two counts of murder and one coun of arson, police said.
The fire broke out in a single-family home that left a mother and her daughter dead and several others injured.
Relatives identified the victims as Ieashia Ford and her 10-year-old daughter Porsche.
RELATED: Gresham fire: Deaths of mother, daughter ruled homicides due to arson
The pair were sleeping when someone set the house on fire, according to the family.
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"She went back in to get her daughter," said Darryl Fields, the victims' relative. "They passed away in the doorway and she had the baby in her arms."
Family said the fire took place hours after an argument between the mother and an acquaintance relatives said had been harassing her.
"He was sending her text messages and threatening her," said fellow family member Felicia White. "That he was going to set her house on fire."
"He killed my two cousins. Her and her daughter," added relative David Wilson.