Officials said he had been taken into custody without incident by a team that included officers from the U.S. Marshals Service, the Texas Department of Public Safety and a tactical unit from the Border Patrol.
The killings occurred late Friday. Officials said Mr. Oropesa had been firing a gun that night in his front yard outside Cleveland, on a plot of land smaller than an acre in a row of similarly sized properties along a rutted dirt road. His immediate neighbors, a family from Honduras, complained about the noise, to both Mr. Oropesa and the police via 911, around 11:30 p.m.
Officers did not immediately go to the area, where residents have long complained of dangerously wanton gunfire. Soon after the complaints, officials said, Mr. Oropesa could be seen on a doorbell video entering his neighbor Wilson Garcia’s home, armed with an AR-15-style rifle.
Five people were fatally shot inside the home, according to the F.B.I.: Mr. Garcia’s wife, Sonia Guzman, 25; his son, Daniel Enrique Laso, 9; Diana Velazquez Alvarado, 21; Juliza Molina Rivera, 31; and Jose Jonathan Casarez, 18.
Officials declined to answer questions on Tuesday about the speed of the response to the killings.
The top official in San Jacinto County, Fritz Faulkner, said in a telephone interview that he had been alerted to the arrest shortly after it happened. The killings had shocked the community, he said, and the county was now, after several days, finally able to rest easy.
“I’m just elated,” Mr. Faulkner said.
Kirsten Noyes contributed research.