This story has been updated.

The Bexar County Medical Examiner has released the names of the two remaining victims found at the site of a major blast on rural property on the city’s Southeast Side late Friday night.

The office identified 57-year-old William Thompson and 61-year-old James Gus Kalisek. The office identified Ashley Nicole Autobee, 28, on Tuesday, and Roger Huron Jr, 36, over the weekend.

Huron’s cause of death was listed as “injuries sustained in an apparent explosion,” while for Kalisek, Thompson and Autobee, it was “complications of injuries sustained in an apparent explosion.” The office did not immediately respond to questions regarding the difference in those causes.

A San Antonio Fire Department spokesman said Wednesday the investigation is pointing toward a possible gas leak as the cause of the explosion.

Investigators are looking at the possibility of a gas leak from “several 100-gallon,” propane tanks on the property, but not inside the underground home, said SAFD spokesman Joe Arrington.

“We’re not talking about a propane tank like for a gas grill,” Arrington said. These tanks were “used for water heaters, cooking and things in the house, the larger tanks.”

Arrington said people who were on site prior to the blast told officials during interviews that the propane tank had recently been worked on. On Tuesday, officials said those people said they smelled gas before the explosion, but did not report it.

The Bexar Appraisal District lists the owners of 9720 S. Presa Street as James Kalisek and Brian Kalisek. Kalisek is also the name of the company officers of K-Bar Services, Inc., according to a listing with the Better Business Bureau. Brian Kalisek is listed as vice president; Michelle Kalisek as president.

The appraisal district shows 9479 South Presa Street is also owned by the Kaliseks, doing business as Kalisek Farms.

Investigators said Tuesday at a press conference that the blast originated inside a 4,000-square-foot home built completely underground, but that the cause had yet to be determined.

Investigators have ruled out a drug lab or explosive devices as a cause of the blast, which was so powerful evidence was found 150 yards beyond the radius of the blast site, said San Antonio Fire Chief Charles Hood Tuesday at the Public Safety headquarters downtown.

He described the scene as “absolutely unsettling,” with some large trees on the property “disintegrated and charred.

“You don’t see things like this type of explosion inside of a building like this… This explosion happened underground, so you can imagine the violence of this scene and the explosion.”

The home was about 4,000 square feet and was constructed with six to eight inch concrete walls and heavy, rebar construction similar to a high rise structure, officials said. 

Doug Berry, division chief of fire department’s arson bureau, said “some of the people that were on the property several hours before the explosion” said they smelled gas, but apparently no one reported it.

Officials shared an aerial image of the damage from the blast on Tuesday. The cause is still being investigated. Credit: Bria Woods / San Antonio Report

He confirmed that the home did not have natural gas service from CPS Energy, but said investigators are “examining the propane tank that’s on the site,” he said, one of several leads investigators are still tracking down.

The home, which Berry said was owned by “a man, wife and brother,” was built 12 feet below ground, with the roof about a foot below the grass, on 75 acres of property.

“They were home at the house, in the residence, at the time,” Berry said when asked if the owners were on site, but would not confirm if any of the owners were victims. 

Hood said officials found about 100 construction vehicles, including tank trucks, RVs and cars on the property as well.

“The entire 75 acres is home to all the construction equipment, a maintenance shop, things like that. The entire property is used to house the business equipment, but this was being used as a residence,” he said.

Six dogs were also found alive on the property and have been reunited with their owners, officials said.

Investigators continue working the scene with the help of the Public Works department, which is helping remove heavy debris from the scene, officials said. 

Excavation of the structure has been delayed by weather, with “murky” rainwater having to be pumped out of the hole multiple times, Hood said.

The scene has been cleared of potential other hazards, officials said, but remains unsafe due to structure debris.

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Raquel Torres

Raquel Torres is the San Antonio Report's breaking news reporter. She previously worked at the Tyler Morning Telegraph and is a 2020 graduate of Stephen F. Austin State University.