Suzette Troutman, 45, worked as an aide for Waldiman Thompson and his 100-year-old wife Ethlin.
2nd arrest in deadly home invasion
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She was not hired through an agency, but would run errands for the couple and help them with their grocery shopping.
She is facing charges of second degree murder, two counts of burglary and two counts of assault.
Last week, police had also arrested Dwayne Blackwood, 27.
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He kept his head down and tried to ignore the questions as detectives led him out of the stationhouse Friday night.
He is also facing charges of second degree murder and second degree assault.
Police say Blackwood and another man pushed their way into the elderly couple's brownstone on nearby Decatur St.
They say at 3 p.m., they tied up the Thompsons before making off with several thousand dollars in a lockbox.
Ethlin survived, but the ordeal was too much for the love of her life who died before her eyes.
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Photos: Scene of deadly home invasion in Brooklyn
In addition to Troutman and Blackwood, police are continuing to search for at least one more person.
They know who he is, but have not released his name. He is seen on video walking away from the couple's home holding a lockbox believed to have held thousands in cash.