He opened fire before the babysitter opened the door.
"She collapsed on the ground," Ridley Detective Sgt. Scott Willoughby said of Arrington. "He stood above her and continued to fire into her - upwards of 11 times."
"He became desperate," said her mother, Audra Thornton-Arrington, "and he took my baby from me."
It wasn't the first life that Michael has taken, Delaware County District Attorney G. Michael Green said yesterday afternoon.
In a phone confession that he made to two friends after killing Arrington, Michael admitted to slaying two sons he had fathered with other women, Green said.
The causes of deaths of 4-year-old Lamar Patrick on Sept. 29, 2005, and of 4-month-old Alijah Townes on July 21, 2007, had been ruled "undetermined" by the county Medical Examiner's Office. But both boys' mothers were "extremely suspicious" of the circumstances of their deaths, Green said.
Michael had been interviewed in relation to both cases and had maintained his innocence, Green said.
Michael confessed at about midnight Monday while holed up in his dad's house on 23rd Street in Chester, where he had gone after shooting Arrington.
Moments later, he was shot by a Chester police officer and was pronounced dead at 12:36 a.m. yesterday. Green said that Michael refused to drop his gun when police asked.
Michael had been living with his father, John Michael, a 15-year veteran of the force. He was in Florida at the time.
"That telephone conversation took place literally minutes before the exchange with Chester police that resulted in his death," Green said of the confession. "Up until this moment, this is the first firm information we have suggesting that his hand had any part to do with the death of Lamar Patrick and Alijah Townes."
