AUSTIN -- Investigators are still piecing together what led an Austin man to stab his father to death. Just after 6 p.m. Sept. 18, investigators were called to the 2600 block of Horseshoe Bend Drive in West Austin.
Alexander Scott Ervin, 20, immediately asked for a lawyer as police took him into custody.
Investigators found his father, 58-year-old Scott Ervin with stab wounds to his torso and lower body. He was rushed to University Medical Center Brackenridge where he was pronounced dead around 7 p.m.
Police say Ervin's other son witnessed the stabbing and called 911. They don't know what sparked the violence.
"We're still looking into it. For the most part, right now, all we can tell is he just snapped," said Austin Police Department Sgt. Brian Miller.
This was not the first time police have been called to the Ervins' home. They'd been there twice before -- once in 2011 and again in 2012. They deemed Alexander an emotionally disturbed person.
Police say he had been living at home with his parents and didn't have a job.
Investigators plan to file murder charges against Alexander. He remains in custody at the Travis County Jail.
Police say the incident's affidavit will be released Friday and will contain more details.