Authorities on Monday revealed that they had reason to believe that Sunday's mass shooting at a church in Sutherland Springs, Texas, carried out by Devin Kelley, stemmed from a domestic dispute.

What are the latest updates?

According to CBS News, law enforcement revealed that the church massacre wasn't perpetrated because of religious beliefs or racial divides.

Freeman Martin, Texas Department of Public Safety regional director, told reporters during a Monday press conference that Kelley sent threatening text messages to his mother-in-law — who attended services at First Baptist Church in Sutherland Springs.

"We wanted to get that out there that this was not racially motivated, it wasn't over religious beliefs," Martin said. "There was a domestic situation going on within the family-in-laws."

He added, "It’s a senseless crime, but we can tell you that there was a domestic situation going on within this. He had expressed anger toward his mother-in-law."

Police were not clear as to what about the texts led them to conclude that Kelley's alleged anti-religious beliefs did not play a role, or why they were so certain on this front.

Is there any more?

In another development, authorities also believe that Kelley fatally shot himself after a high-speed pursuit.

Martin also revealed that Kelley, who was wounded by a Good Samaritan outside of the church, had phoned his father during the chase, telling him that he wasn't going to make it.