LAPLACE — One state away wasn’t far enough to run for one suspected killer, police say.

Frederick Seymore Jr., 22, of LaPlace was arrested Thursday in Houston by the United States Marshals Gulf Coast Regional Fugitive Task Force-Houston Division, St. John the Baptist Parish Sheriff Mike Tregre said.

The Houston Police Department served as the booking agency.

Seymore was identified locally as the suspected shooter in the broad daylight killing of 16-year-old Tory Horton, a rising sophomore at East St. John High School.

Local authorities discovered Seymore’s abandoned Toyota Corolla Wednesday in Jefferson Parish.

“We did a canvass of the area and found video showing Seymore parking the car and someone helping him remove items from the car,” Tregre said. “We identified that individual, and he states he was not made aware, at that time, that Seymore had been involved in a homicide in St. John Parish. Without being knowledgeable, he helped Seymore get on a bus to Houston, Texas.”

Tregre said the individual has been fully cooperative, adding authorities are still investigating but have not charged him at this point.

“He helped tremendously in getting us everything we needed to track (Seymore) to Houston,” Tregre said.

Seymore’s arrest follows that of LaPlace’s Bruce Butler Jr., 22, on the night of Aug. 5.

“That’s the only two involved in this homicide,” Tregre said. “If we find out that someone more than that may have assisted (Seymore) knowing he was involved in this crime, we will pursue.”

According to the sheriff, Butler confessed his involvement to the crime following his arrest and provided authorities with details of the shooting.

Horton was shot one time in the chest at approximately 3:43 p.m. Aug. 5 in the parking lot of LaPlace Discount at the corner of Airline Highway and Cambridge Drive.

Most of the violent encounter was captured on surrounding surveillance video, authorities said, adding the gunman had a dispute with the victim’s brother.

“Basically, (the shooter) couldn’t get the victim’s brother so he shot the younger kid,” Tregre said this week.

After the shooting, Tregre said two men fled the scene in a Toyota Corolla.

Deputies arrested Butler that evening, charging him with principal to second-degree murder. He remains in custody in lieu of a $750,000 bond.

Authorities do not believe Butler was the shooter.

Second suspect and suspected shooter Seymore was at large for seven days until his arrest.

According to Tregre, the homicide was especially tragic because of the victim’s age and innocence.

“This young man had no criminal history,” Tregre said of Horton. “He had no blemishes on his record. He had just helped his grandfather cut grass. He went to get a fresh haircut to go to school. He was in line at the barbershop, but the line was too long so he, like kids do, went to the little grocery store to buy a few things. That is where these assailants saw him and waited for him outside in the parking lot.”