ARLINGTON, Texas -
A tip helped lead officers to the man they say murdered an Arlington mother late last year.
Arlington police said Mario Hernan Lopez Gamez is one of the men who shot April Vancleave outside her apartment on Dec.15. Another suspect is still on the loose.
Vancleave was trying to get some last-minute cash to buy her 6-year-old daughter, Lily, a gift. She and her husband went to the Target store on South Cooper Street and Arbrook Boulevard to sell jewelry through the resale app 5miles.
An arrest affidavit says surveillance video shows the would-be buyers watching the couple from inside a Starbucks, but never going to meet them. The affidavit says the buyers canceled on Vancleave, telling her there was a family emergency. Moments later, their truck follows the couple out of the parking lot.
Police said the truck belongs to Gamez. They believe he and another man followed the couple home. Vancleave's husband dropped her off, and that's when police said the men robbed her, shot her and drove away.
“These guys were predators and they went on this application and they looked for people to target," said Mark Vancleave, the victim’s brother.
Investigators also used the 5miles app to target Gamez. An affidavit says the day after Vancleave's killing, another one of his resale app robbery victims recognized him on surveillance.
The affidavit says she came forward, providing information about Gamez's account on another app, Offer Up. Detectives were able to get GPS coordinates, dates and times of sales from the apps that, according to an affidavit, led police to Gamez' Dallas apartment.
He was arrested in Houston Saturday without incident.
"The good guys prevailed. My sister never did anything asking for this," Mark Vancleave said. "There is one guy behind bars, but there is still one guy left."
Vancleave's family is pleading to the other suspect to turn himself in.
"Just own up to what you did. Be a man and own up to it," Vancleave’s brother said.
Law enforcement officials have not released any information about the second suspect in the case. Police documents seem to suggest that person was the getaway driver.