HOUSTON—Investigators on Wednesday were trying to piece together the events that led to a fatal house fire on Ahrens near Allen Genoa in southeast Houston.

It happened on Tuesday at 5:15 p.m.

Authorities believe a faulty gas meter may have caused the blaze, and oxygen tanks within the home may have caused additional explosions.

The fire claimed the life of 81-year-old Helen Faslun.

CenterPoint Energy is conducting its own investigation into the gas meter.

They say it could take days or even weeks before that investigation is complete.

Meanwhile, all Faslun's son can do now is remember his mother.

“She was a great mom. She raised us four kids and did the best she could,” said Dwayne Faslun.

Dwayne Falsun got the call about the explosion late Tuesday afternoon.

“There was nothing left of the house.  It had been blown apart and that’s when I found out she was still in the house when all of this took place.  The neighbors couldn’t get her out in time.  They did what they could,” said Dwayne Falsun.

Justin Sliter has known Falsun all his life. 

He said he tried to help, but said another explosion rocked the home when he reached Falsun’s front door.

That second blast engulfed the home in flames.

Sliter says he could see Falsun, he just couldn’t reach her.

“She couldn’t stand up.  So she was sitting in the chair just flailing around.  She looked a little disoriented, but she was still conscious and alive.  She was just yelling for help.  The only thing she could do really,” said Sliter.

The 81-year-old is now the fourth Houstonian to die in a fire this year.

On Wednesday, the day after her death, firefighters from nearby Station 29 fanned out through the neighborhood distributing smoke detectors to those who need them. They gave out information too.