Exclusive interview with father of alleged west Houston mass shooter

'He said something was going to happen Monday.'

By Joel Eisenbaum - Investigative Reporter

HOUSTON - A backpack found at the scene of the Memorial Drive mass shooting may hold the key to who committed the crime and why.

The combat style backpack, inexplicably uncollected by the Houston Police Department Sunday, was found Monday, in plain sight, at the service station that caught fire on the 13200 block of Memorial Drive.

The sack contained bullets and a birth certificate, among other items.

From the birth certificate, Channel 2 Investigates was able to tie the backpack to California Army veteran Dionisio Garza III, 25, who served in Afghanistan.

"We have not received confirmation, but I strongly suspect. I really believe this is a PTSD thing," the man's father said by phone, Monday.

Police officers killed Garza Sunday, after an exchange of gunfire.

Garza's father said his son, although loving, had become increasingly troubled over the last few months and decided to travel to Houston to meet others who believed the United States was on the brink of collapse.

"On the internet he met some people or some people that believed like him.

It's better to go to Texas. He was trying to get us all to go over there and you know go live in a compound. That kind of talk, you know? That wasn't my son," the man said.

Channel 2 Investigates located Facebook and Twitter accounts belonging to Garza.

On Twitter, on May 25 of this year he posted:

"When do you think the dollar will collapse? I know this year?"

Garza's father, a missionary, last talked to his son Saturday, just one day before the shooting.

"You know he was rambling off about the economy collapsing, you know. And that something was going to happen by Monday, that kind of stuff. Of course you look back now and there were signs. There were signs," he said.

[See also: Victim killed in west Houston mass shooting identified]

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