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A man charged with murder in a shooting death on Texas 21 Monday told authorities that he spent the day planning to kill the man, according to court documents released Tuesday.

Kevin Eugene Pullen, 46, also was charged with aggravated assault involving family violence and tampering with evidence. He was being held at the Brazos County Jail on Tuesday morning with bail set at $700,000.

Authorities responding to the crime scene west of Bryan near Fazzino Lane discovered Shay Dale Lackey of College Station shot dead in a field and Tiffany Rose Sterling with a gunshot wound.

Pullen told investigators he planned to kill Lackey but never meant to shoot Sterling, the documents state. He said the gun discharged as he was attempting to open the door of the car to talk to her, according to the report from a Brazos County Sheriff's Department investigator.

Officials believe Pullen and Sterling had been in a prior relationship, authorities said.

Sterling was shot in the arm and underwent surgery at CHI St. Joseph hospital in Bryan on Monday night. A portion of a shotgun shell was lodged in her arm, according to the police report. She was expected to recover.