RICHMOND, Texas -- Morbid curiosity was given as the motive by one of two suspects charged with killing 16-year-old Ashton Glover, KPRC Local 2 reported Monday.

Matthew McCombs arrived in Fort Bend County Monday afternoon after he waived extradition from Michigan, where he and Sean Brown were captured while trying to cross the U.S.-Canada border into Ontario.

McCombs and Brown, both 18, were charged with murder in the death of Glover on Wednesday.

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Images: Remembering Ashton Glover
Images: Teens Charged In Ashton Glover's Death

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"McCombs has given a statement," Fort Bend County Sheriff Milton Wright said. "We think the statement, at this point, is pretty accurate because it's collaborated by some of the facts that we have."

Wright said McCombs implicated Brown in the killing but admitted to pulling the trigger.

"The pistol that we recovered in the search warrant at McCombs' house is indeed the murder weapon," Wright said. "Mr. McCombs pulled the trigger (with a) 22-32. It's an old model replica, a frontier model, an old pistol. You can still buy ammunition for it, I think, but those guns have been out of production for some time."

He said that McCombs stole the gun from a friend's grandmother's house in Kerrville.

Wright did not elaborate on the statement or motive in order to not jeopardize the case. He also would not say why Glover was the victim.

"I'll have to stop with the statement made -- morbid curiosity. Of course, there's more answers to that, but, after conferring with the district attorney and others, they requested that we not go beyond that," he said.

Wright said Glover was shot in the head on July 7 in the field where she was found three days later. After the teens killed Glover, they went to breakfast before returning to bury her, officials said.

"It was premeditated," Wright said. "We were talking to the district attorney earlier, and I don't believe it's going to reach, at this point, the level of a capital murder."

McCombs will go before a judge for a probable cause hearing Tuesday morning.

Brown is fighting extradition, but authorities hope to bring him back to Texas soon. Another hearing will be held next month.

Glover was last seen at the It's A Grind coffee shop on Sweetwater Boulevard in Sugar Land. She was found dead by a construction crew laying utility lines off of Oil Field Road and Thompson's Ferry Road on July 10.

Glover's mother went to the Fort Bend County jail to catch a glimpse of one of the people accused of killing her daughter.

"I just miss my baby and I just want justice to be served. That's all I want," mother Sue Smith said.

Memorial Fund Set Up

A memorial fund was set up in Glover's name. Donations can be made at any Amegy Bank branch or they can be mailed to the following address.

First Colony Church of Christ
Ashton Glover Memorial Fund
2140 First Colony Blvd.
Sugar Land, TX 77479