San Marcos Mercury | Local News from San Marcos and Hays County, Texas
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4:53 p.m. OCT. 6: Johnathan Ivan Alonzo Guia surrendered to authorities at the Hays County Government Center at 3:15 p.m. Oct. 6.  He is now in custody at the Hays County Law Enforcement Center. San Marcos police continue the investigation.


9:55 a.m. OCT. 6: San Marcos police are searching for a suspect in a fatal shooting last week that left one man dead in an encountered described as a drug deal gone wrong.

Wanted: Johnathan Guia

Wanted: Johnathan Guia

Johnathan Ivan Alonzo Guia, 22-year-old who also goes by the nicknames “Nuno” and “Barney,” has an active arrest warrant for murder in connection with a homicide that occurred early Friday, Oct. 2. Guia has a lengthy criminal history, has violent tendencies and was seen with a handgun during the commission of the homicide. 

Another suspect believed to have been the actual shooter, 19-year-old Bryan Martinez was located and arrested early Saturday morning in San Marcos. A search warrant was executed at an address in Guadalupe County to search for evidence related to the homicide.

In Custody: Bryan Martinez

In Custody: Bryan Martinez

San Marcos police officers found Issac Olvera, 21, shot in the abdomen at 2:29 a.m. Friday when they responded to a reported shooting at a residence on the 1300 block of Thorpe Lane.

Officers administered first aid until EMS arrived a short time later. Olvera’s condition worsened while en route to University Medical Center-Brackenridge hospital, and he was instead transported to Seton-Kyle where he died of his injuries. 

Multiple witnesses on scene report that a narcotics deal was taking place at the time of the shooting. Three individuals, including the shooter, fled the scene.

People with information on Guia’s location are asked to contact Detective Tiffany Williams at 512-753-2306 from 8 a.m. to 5 p.m. Monday through Friday or the SMPD non-emergency line at 512.753.2108 after hours. 

Tips can be made to or Crime Stoppers of Hays County at

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