Police said Monday that Crusius took about 11 hours to travel to El Paso from Allen, Texas.
"As soon he got here he was lost in the neighborhood," El Paso Police Chief Greg Allen said Monday. "After that he found his way to the Walmart because we understand he was hungry and that's about as far as I can go without getting into too much detail."
Two more deaths were announced by El Paso police and Del Sol Medical Center on Monday, bringing the death toll to 22. One died overnight and the other died Monday morning.
"Unfortunately these wounds have been devastating and major, and we are deeply saddened to be here today to have to tell you that two patients have passed," Dr. Stephen Flaherty, the hospital's trauma medical director, told reporters in El Paso on Monday. "We are truly heartbroken to be here to have to report this."
The El Paso murder suspect's grandparents said Crusius had recently lived with them in the Dallas suburb of Allen, Texas. Larry and Cynthia Brown said the alleged killer moved out of their home six weeks ago and that they're cooperating with authorities.
“We are devastated by the events of El Paso, and pray for the victims of this tragedy. Patrick Crusius is our grandson. He lived with us in our house in Allen, Texas, while he attended Collin College," according to the grandparents' statement.
"He moved out of our house six weeks ago, and has spent a few nights here while we were out of town. His driver’s license and mailing address were at our house in Allen. That connection has made us a focus of media, of course. We are talking only to law enforcement agencies, and will not be making further statements to the media. We request the media to honor our privacy.”
A visibly frustrated Dayton Police Department Chief Richard Biehl said that, even 34 hours after Connor Betts started firing, detectives were not sure whether 22-year-old Megan Betts was an intended victim.
"It’s a question I’ve asked more than once," Biehl told reporters. "And I don’t think we can know that for certain."
Dayton's police chief admitted he's gone back and forth, trying to get inside the mind of Betts, 24, who was killed by police.
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Biehl was asked specifically whether Megan Betts could have been caught in the spray of bullets — and the chief could not rule that out.
"It seems to just defy believability he would shoot his own sister, but it's also hard to believe that he did not recognize that was his sister" in the path of gunfire, Biehl said.
Betts opened fired in a crowded entertainment district in downtown Dayton in the early morning hours of Sunday, killing nine and injuring at least 27.
Police are still far away from establishing a motive.
"Not close enough, not close enough at all," Biehl said.
In addition to Megan Betts, the others killed on Sunday were Lois Oglesby, 27; Saeed Saleh, 38; Derrick Fudge, 57; Logan Turner, 30; Nicholas Cumer, 25; Thomas McNichols, 25; Beatrice Warren-Curtis, 36; and Monica Brickhouse, 39.
Six of nine slain are African American but police still can't say whether race could have been a motivating factor.
"We have a lot of evidence still to go through," Biehl explained. "Just based on where we're at now, we are not seeing any indication of race being a motive."
Betts was shot dead by police just outside Ned Peppers Bar.
The gunman was armed with magazines, that if all full, would have carried 250 rounds, police disclosed on Monday. Police said they've recovered at least 41 shell casings fired by Betts.
"Grieving is a process and we’ve had great sadness over the past many hours, but now it’s really turning to anger — anger about the lack of movement on gun control," City Commissioner Chris Shaw said on Monday.
"We have to do something … pushing the Legislature and the federal government to move on responsible gun control in this community and this country," Shaw said.
And the police chief also said there's no good reason for civilians to have their hands on rapid-fire weapons.
"It's problematic," Biehl said. "It is fundamentally problematic to have that level of weaponry in a civilian environment."
David K. Li
David K. Li is a breaking news reporter for NBC News.
Doha Madani is a breaking news reporter for NBC News.