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While they could not explain why the sheriff’s deputy did not arrest Mr. Walker when the protective order was served, officials said that as a general rule a misdemeanor charge such as the second-degree assault warrant wouldn’t have been categorized as a priority.

But Lt. Col. Payne said that after reviewing Mr. Walker’s arrest history, which includes five emergency mental health evaluations and a first-degree rape charge since 2004, the sheriff’s office upgraded his warrant to priority status.

“We locked him up pretty quickly for a second-degree assault,” Lt. Col. Payne said of the 21-day period from when assault charges were filed and Mr. Walker was taken into custody.

Mr. Walker is now being held at the Department of Corrections without bond, police said.

On at least five occasions in the past several years, sheriff’s deputies have been called to his home to hospitalize him, Ms. Taylor said. In 2004, Mr. Walker was charged with first-degree rape. However, he was found mentally incompetent to stand trial and pleaded guilty to the lesser charge of second-degree assault.

When reached for comment Tuesday, a family member who declined to identify herself was unaware that Mr. Walker had been charged with murder and disputed the allegation.

“He can’t be charged with murder,” the woman said. “We heard the gunshot and me and my husband and Deangelo were in the house.”