Not a lot of information. Will check back later.
Per an interview with the police chief here on KLBJ AM radio this morning, the officer was called to a drunk disturbance at Walmart.
When he arrived in the store and approached the man a fight ensued.
The man then drew a weapon and shot the officer in the neck.
The office went down but got out a call - he did not draw his weapon and return fire.
Two Walmart employess tackled the shooter and held him until the back-up officers (who were already enroute) arrived.