Terrell police zeroed in on the wrong suspect in the first hours of Monday night's shooting spree in which five people were killed, according to court documents released late Thursday.
Investigators at first suspected the husband of one of the first two women killed.
Robert Walker was taken to the police station for questioning after he called police at about 4:30 p.m. to report he had returned home from work and found his wife, Belinda, injured from an apparent gunshot wound.
Walker's nephew, Charles Brownlow, was later arrested and charged in the rampage.
In a request to search Walker's house, a Terrell officer wrote he had "good reason to believe, does believe and hereby charges" Walker with murder.
It doesn't appear Walker was actually charged with the crime because the officer's allegations came in a search warrant, not an arrest warrant.
"Robert Walker had blood on his pants and shoes," the officer wrote, adding Walker had been questioned at the police station and "showed no signs of remorse."
The timing of the search warrant is notable because a judge signed it at 10:25 p.m. -- about the same time three more people were shot and killed.
Walker appeared at a vigil Wednesday night and said he had forgiven Brownlow for killing his wife.
"How can I not love him?" Walker said. "He's my nephew. I'll always love him."